Micropaedia Index
- 1054, Schism of
- 12-tone music
- 1688, Revolution of
- 1763, Proclamation of
- 1801, Concordat of
- 1812, War of
- 1830, revolutions of
- 1848, Revolutions of
- 1850, Compromise of
- 1927, Generation of
- 21-centimetre radiation
- 26th of July Movement
- 3-D
- 30 Doradus
- 38th parallel
- 4-H Club
- 61 Cygni
- '98, Generation of
- a cappella
- a posteriori knowledge
- a priori knowledge
- A'sha, al-
- A-ch'eng
- A-erh-chin Mountains
- A-kuei
- A-mdo
- A-pao-chi
- 'A`ishah
- Aachen
- Aakjær, Jeppe
- Aalen
- Aalsmeer
- Aalst
- Aalto, (Hugo) Alvar (Henrik)
- Aarau
- aardvark
- aardwolf
- Aare River
- Aargau
- Aaron
- Aaron ben Elijah
- Aaron, Hank
- Aaronic priesthood
- Aasen, Ivar (Andreas)
- Aba
- abaca
- abacus
- Abadan
- Abae
- Abahai
- Abaiang Atoll
- Abakaliki
- Abakan
- Abakanowicz, Magdalena
- abalone
- Abancay
- abandonment
- Abasiyanik, Sait Faik
- abatement
- Abauzit, Firmin
- Abaza language
- 'Abbadid DYNASTY
- Abbadie, Antoine-Thomson d'; and Abbadie, Arnaud-Michel d'
- Abbado, Claudio
- 'Abbas I
- 'Abbas II
- 'Abbas Mirza
- Abbas, Ferhat
- 'Abbasid DYNASTY
- Abbate, Niccolò dell'
- Abbe, Cleveland
- Abbe, Ernst
- abbess
- Abbeville
- Abbevillian industry
- abbey
- Abbey Theatre
- Abbey, Edwin Austin
- abbot
- Abbot, C.G.
- Abbotsford
- Abbott, Berenice
- Abbott, Bud; and Costello, Lou
- Abbott, George (Francis)
- Abbott, Grace
- Abbott, Jacob
- Abbott, Lyman
- Abbott, Sir John (Joseph Caldwell)
- Abbottabad
- abbreviation
- ABC
- Abd al-Aziz
- 'Abd al-Ghani
- Abd al-Hafid
- 'Abd al-Ilah
- 'Abd al-Malik
- 'Abd al-Mu`min
- 'Abd al-Qadir al-Jilani
- 'Abd al-Wadid DYNASTY
- 'Abd Allah
- 'Abd Allah ibn al-'Abbas
- 'Abd Allah ibn az-Zubayr
- 'Abd Allah ibn Sa'd ibn Abi Sarh
- 'Abd Allah, Khawr
- Abd ar-Rahman
- 'Abd ar-Rahman I
- 'Abd ar-Rahman II
- 'Abd ar-Rahman III
- Abd el-Krim
- 'Abd-us-Samad, Khwaja
- 'Abdali sultanate
- Abdelkader
- Abdera
- abdominal cavity
- abdominal muscle
- 'Abdor Rahman Khan
- abduction
- abductor muscle
- 'Abduh, Muhammad
- Abdul Rahman Putra Alhaj, Tunku (Prince)
- Abdul Rahman, Tuanku
- Abdul Razak bin Hussein, Tun Haji
- Abdul-Jabbar, Kareem
- Abdülaziz
- Abdülhak Hâmid (Tarhan)
- Abdülhamid I
- Abdülhamid II
- Abdulla, Muhammed Said
- Abdullah
- Abdullah bin Abdul Kadir
- Abdullah, Sheikh Muhammad
- Abdülmecid I
- Abdülmecid II
- Abe Isoo
- Abe Kobo
- Abe Masahiro
- Abéché
- Abegg, Richard Wilhelm Heinrich
- Abel
- Abel Tasman National Park
- Abel, Carl Friedrich
- Abel, John Jacob
- Abel, Niels Henrik
- Abel, Rudolf (Ivanovich)
- Abel, Sir Frederick Augustus
- Abel, Theodora Mead
- Abelard, Peter
- Abell, A(runah) S(hepardson)
- Abell, Kjeld
- Abelson, Philip Hauge
- Abemama Atoll
- Abengourou
- Åbenrå
- Abeokuta
- Aberconwy
- Abercrombie & Fitch Co.
- Abercrombie, James
- Abercrombie, Lascelles
- Abercrombie, Sir Patrick
- Abercromby, Sir Ralph
- Aberdare
- Aberdare Range
- Aberdeen
- Aberdeen, George Hamilton-Gordon, 4th Earl of, VISCOUNT GORDON OF ABERDEEN, VISCOUNT OF FORMARTINE, LORD HADDO, METHLICK, TARVES, AND KELLIE
- Aberdeenshire
- Abergavenny
- Aberhart, William
- Abernathy, Ralph David
- aberration
- aberration, constant of
- Abertillery
- Aberystwyth
- abettor
- Abgar legend
- Abha
- Abhayagiri
- abhibhvayatana
- Abhidhamma Pitaka
- Abhidhammattha-sangaha
- Abhidhammavatara
- Abhidharmakosha
- abhijña
- Abhinavagupta
- Abhisamayalankaraloka
- abhiseka
- Abia
- Abiathar
- 'Abid al-Bukhari
- Abidjan
- abietic acid
- Abigail
- Abijah
- Abildgaard, Nicolai Abraham
- Abilene
- Abingdon
- Abington
- Abington, Fanny
- Abipón
- Abitibi River
- Abkhaz
- Abkhazia
- Abkhazo-Adyghian languages
- Ableman v. Booth
- ablution
- Abnaki
- Abney, Sir William de Wiveleslie
- ABO blood group system
- Åbo, Treaty of
- abolitionism
- Abomey
- Abominable Snowman
- abortion
- Abqaiq
- Abraha
- Abraham
- Abraham bar Hiyya
- Abraham Lincoln Battalion
- Abraham, Karl
- Abraham, Plains of
- Abrahams, Israel
- Abrahams, Peter (Henry)
- abrasive
- abraxas
- Abreu, Capistrano de
- Abruzzi
- Abruzzi, Luigi Amedeo Giuseppe Maria Ferdinando Francesco, Duke (duca) d'
- Abruzzo, Ben L.
- Abs, Hermann J.
- Absalom
- Absalon
- Absaroka Range
- abscess
- absentee ownership
- absentee voting
- Abseron Peninsula
- absinthe
- Absolute Idealism
- absolute zero
- absolution
- absolutism
- absorption
- Abstbessingen faience
- abstract art
- Abstract Expressionism
- Abstraction-Création
- Absurd, Theatre of the
- Abu
- Abu `l-Fadl 'Allami
- Abu al-'Abbas as-Saffah
- Abu al-'Atahiyah
- Abu al-Faraj al-Isbahani
- Abu al-Fida`
- Abu al-Ghazi Bahadur
- Abu al-Hasan
- Abu al-Hasan 'Ali
- Abu al-Qasim
- Abu al-Wafa`
- Abu Bakar
- Abu Bakr
- Abu Dhabi
- Abu Hanifah
- Abu Jirab
- Abu Kalijar al-Marzuban ibn Sultan ad-Dawlah
- Abu Madi, Iliya
- Abu Muslim
- Abu Nidal
- Abu Nuwas
- Abu Qir Bay
- Abu Rishah, 'Umar
- Abu Ruwaysh
- Abu Shahrayn
- Abu Simbel
- Abu Sir
- Abu Tammam
- Abuja
- Abukuma-sammyaku
- Abuná River
- Abutilon
- Abydos
- abyssal hill
- abyssal plain
- abyssal zone
- Abyssinian
- acacia
- Acacian Schism
- academic freedom
- Academy
- Academy Bay
- Academy of Venice, Galleries of the
- Academy, Gallery of the
- Acadia
- Acadia National Park
- Acadian orogeny
- Acajutla
- Acámbaro
- Acanthaceae
- acanthus
- Acapulco
- Acaraí Mountains
- Acarigua
- Acarina
- Acarnania
- acatalasia
- acceleration
- acceleration stress
- accelerator
- accelerometer
- accent
- accentor
- acceptance
- Accesi, Compagnia degli
- accessory
- accessory mineral
- acciaccatura
- Acciaiuoli, Niccolò
- accidental
- accipiter
- Accius, Lucius
- acclimatization
- accompaniment
- accomplice
- Accoramboni, Vittoria
- accordion
- account payable
- account receivable
- accounting
- accounting machine
- Accra
- acculturation
- Accursius, Franciscus
- accused, rights of
- Ace, Goodman
- Aceh
- Aceraceae
- acervulus
- Acestes
- Acetabularia
- acetaldehyde
- acetaminophen
- acetanilide
- acetic acid
- acetone
- acetophenetidin
- acetophenone
- acetylcholine
- acetylene
- Acevedo Díaz, Eduardo
- Achaea
- Achaean
- Achaean League
- Achaemenes
- Achaemenian DYNASTY
- Achaemenid DYNASTY
- Achagua
- Aché
- Acheampong, Ignatius Kutu
- Achebe, Chinua
- Achelous River
- Achenbach, Andreas
- Achenbach, Oswald
- achene
- Achernar
- Acheron
- Acheson, Dean (Gooderham)
- Acheson, Edward Goodrich
- Acheulian industry
- Achill
- Achilles
- Achilles Painter
- Achilles paradox
- Achilles Tatius
- Achilles tendon
- Achillini, Alessandro
- Achinese
- Achinese War
- Achinsk
- Acholi
- achondrite
- achondroplasia
- acid
- acid and basic rocks
- acid dye
- acid halide
- acid rain
- acid-base catalysis
- acid-base reaction
- acidosis
- Acireale
- Acis
- Ackerley, J.R.
- Ackermann, Konrad Ernst
- Ackermann, Louise-Victorine
- Acmeist
- acne
- Acoemeti
- acolyte
- Acoma
- Aconcagua River
- Aconcagua, Mount
- Aconcio, Giacomo
- aconite
- Acontius
- acorn and nut weevil
- acorn worm
- acosmism
- Acosta, Joaquín
- Acosta, José de
- Acosta, Uriel
- acouchi
- acoustic impedance
- acoustic interferometer
- acoustic neuroma
- acoustic trauma
- acoustics
- acquired character
- acquittal
- Acrasieae
- acre
- Acre River
- acriflavine
- acrobatics
- acrocephalosyndactyly
- acrocyanosis
- acrolith
- acromegaly
- acropolis
- Acropolites, George
- acrostic
- acroterion
- acrylic compound
- acrylic painting
- Act of Parliament clock
- Acta
- Actaeon
- actin
- acting
- actinide
- actinium
- actinium series
- actinolite
- actinometer
- actinomycete
- actinomycosis
- actinomyxidian
- action
- Action Française
- Action painting
- action potential
- Actium, Battle of
- activated-sludge method
- activation
- activation energy
- activity
- activity coefficient
- Acto Adicional of 1834
- Acton (of Aldenham), John Emerich Edward Dalberg Acton, 1st Baron, 8TH BARONET
- Acton, Sir John Francis Edward, 6TH BARONET
- actor-manager system
- Actors Studio, The
- Acts of the Apostles, The
- actuary
- Acuff, Roy
- acupuncture
- ad valorem tax
- Ada
- Ada group
- adab
- Adad
- 'adah
- Adair v. the United States
- Adair, John
- Adal
- Adalbero OF ARDENNES
- Adalbert
- Adalbert, SAINT
- Adam and Eve
- Adam and Eve, Life of
- Adam BROTHERS
- Adam DE LA HALLE
- Adam OF BREMEN
- Adam's Bridge
- Adam's Peak
- Adam, Adolphe
- Adam, Paul
- Adam, Robert
- Adamawa
- Adamawa Plateau
- Adamawa-Eastern languages
- Adamic, Louis
- Adamnan, SAINT
- Adamnan, Vision of
- Adamov, Arthur
- Adams
- Adams FAMILY
- Adams, Abigail
- Adams, Ansel
- Adams, Brooks
- Adams, Charles Follen
- Adams, Charles Francis
- Adams, Franklin Pierce
- Adams, Henry (Brooks)
- Adams, Herbert Baxter
- Adams, John
- Adams, John Couch
- Adams, John Quincy
- Adams, Léonie (Fuller)
- Adams, Marian
- Adams, Maude
- Adams, Robert
- Adams, Roger
- Adams, Samuel
- Adams, Samuel Hopkins
- Adams, Walter (Sydney)
- Adams, William
- Adams, William Taylor
- adamsite
- Adamson, Joy; and Adamson, George
- Adana
- Adangme
- Adanson, Michel
- Adapa
- Adapazari
- adaptation
- adaptive radiation
- adat
- Adda River
- Addams, Charles (Samuel)
- Addams, Jane
- addax
- adder
- Adderly, Herb
- adding machine
- Addis Ababa
- Addison (of Stallingborough), Christopher Addison, 1st Viscount, BARON ADDISON OF STALLINGBOROUGH
- Addison's disease
- Addison, Joseph
- Addison, Thomas
- addition reaction
- additive
- Addo Elephant National Park
- adductor muscle
- Ade, George
- Adela
- Adelaer
- Adelaide
- Adelaide River
- Adelaide, SAINT
- adelantado
- Adelard OF BATH
- Adélie Coast
- Adelphi University
- Adelung, Johann Christoph
- Aden
- Aden, Gulf of
- Adena culture
- Adenauer, Konrad
- Adenet LE ROI
- adenine
- adenoids
- adenosine triphosphate
- adenovirus
- Adeodatus II
- Ader, Clément
- adhan
- Adhémar DE CHABANNES
- Adhémar OF MONTEIL
- adhesive
- Adi Granth
- Adi-Buddha
- adiabatic demagnetization
- adiabatic process
- Adiabene
- Adiantaceae
- adiaphorism
- Adige River
- 'Adil Shahi DYNASTY
- Adilabad
- adipose cell
- Adirondack Mountains
- adit
- Aditi
- Adiyaman
- adjustment
- adjuvant
- Adkins v. Children's Hospital
- Adler, Alfred
- Adler, Cyrus
- Adler, Dankmar
- Adler, Felix
- Adler, Guido
- Adler, Kurt (Herbert)
- Adler, Larry
- Adler, Lawrence James
- Adler, Mortimer J.
- Adler, Nathan Marcus
- Adler, Stella
- Adler, Victor
- Adlersparre, Georg, Greve
- Admetus
- administrative law
- admiral
- Admiral carpet
- Admiral's Cup
- Admiral's Men
- Admiralty
- Admiralty Inlet
- Admiralty Islands
- Ado-Ekiti
- adobe
- adolescence
- Adolf
- Adolf Frederick
- Adoni
- Adonias Filho
- Adonijah
- Adonis
- Adonis, Joe
- adoption
- Adoptionism
- Adorno FAMILY
- Adorno, Theodor Wiesengrund
- Adour River
- Adowa, Battle of
- Adrano
- Adrar
- adrenal gland
- adrenergic drug
- adrenergic nerve fibre
- adrenocorticotropic hormone
- adrenogenital syndrome
- Adret, Solomon ben Abraham
- Adrets, François de Beaumont, baron des
- Adria
- Adrian
- Adrian (of Cambridge), Edgar Douglas Adrian, 1st Baron
- Adrian I
- Adrian II
- Adrian III, SAINT
- Adrian IV
- Adrian V
- Adrian VI
- Adrianople, Battle of
- Adriatic Sea
- adsorption
- 'Adud ad-Dawlah
- adularia
- 'Adullam
- Adullamite
- adult education
- adultery
- adulthood
- Adur
- Advaita
- Advance Australia Fair
- advection
- Advent
- Advent Christian Church
- Adventist
- adversary procedure
- adverse possession
- advertising
- advertising coloration
- advisory opinion
- advocate
- Advocates, Faculty of
- Adwa
- Adwick le Street
- Ady, Endre
- Adygeya
- adz
- Adzopé
- AE
- Aeacus
- Aechmea
- aecium
- Aedesius
- aedile
- Aedon
- Aedui
- AEG AG
- Aegean civilizations
- Aegean Sea
- Aegilops
- Aegina
- aegirine
- aegis
- Aegithalidae
- Aegospotami, Battle of
- Aehrenthal, Aloys, Count Graf Lexa von
- Aelfheah, SAINT
- Aelfric
- Aelia Capitolina
- Aelian
- Aelianus
- Aelle
- Aelred OF RIEVAULX, SAINT
- Aemilian
- Aeneas
- Aenesidemus
- Aeolian harp
- aeolipile
- Aeolis
- Aeolus
- aeon
- Aepinus, Franz Maria Ulrich Theodor Hoch
- Aepyornis
- Aequi
- Aer Lingus
- aerarium
- aerial perspective
- aerial photography
- aerobatics
- aerobics
- aerodynamics
- Aeroflot
- aerophone
- aerosol
- aerosol container
- aerospace engineering
- aerospace medicine
- Aeschbacher, Hans
- Aeschines
- Aesir
- Aesop
- Aesopus, Claudius
- Aestheticism
- aesthetics
- Aeterni Patris
- Aethelbald
- Aethelberht
- Aethelberht I
- Aethelflaed
- Aethelfrith
- Aetheling
- Aethelred
- Aethelred I
- Aethelweard
- Aethelwulf
- Aethra
- Aëtius
- Aetius, Flavius
- Aetolia
- Aetolia and Acarnania
- Aetolian League
- Afanasev, Aleksandr Nikolayevich
- Afar
- affections, doctrine of the
- affective disorder
- affective fallacy
- Affenkapelle ware
- affenpinscher
- affidavit
- affirmation
- affirmative action
- affix
- Affleck, Thomas
- affray
- Affre, Denis-Auguste
- affreightment
- affricate
- Afghan carpet
- Afghan hound
- Afghan interlude
- Afghan War
- Afghanistan
- 'Aflaq, Michel
- Afonso I
- Afonso II
- Afonso III
- Afonso IV
- Afonso V
- Afonso VI
- Afram River
- Afranius, Lucius
- Africa
- African arts
- African Development Bank
- African Games
- African Greek Orthodox Church
- African horse sickness
- African hunting dog
- African languages
- African Methodist Episcopal Church
- African Methodist Episcopal Zion Church
- African National Congress
- African Pygmy local race
- African swine fever
- African Trade Union Unity, Organization of
- African Unity, Organization of
- African violet
- Africanus, Sextus Julius
- Afridi
- Afrikaans language
- Afrikaner Bond
- Afrikaner-Broederbond
- Aftasid DYNASTY
- Aftenposten
- afterburner
- afterimage
- afterpiece
- afterripening
- Aftonian Interglacial Stage
- 'Afula
- Afyon
- AG catalog
- aga
- Aga Khan I
- Aga Khan II
- Aga Khan III
- Aga Khan IV
- Agadez
- Agadir
- Agadir Incident
- Agaie
- Agaja
- Agalega Islands
- Agam, Yaacov
- agama
- Agamemnon
- Agamidae
- Agana
- agape
- Agapetus I, SAINT
- Agapetus II
- agar
- Agaricales
- Agartala
- Agarwala
- Agasias
- Agassiz, (Jean) Louis (Rodolphe)
- Agassiz, Alexander (Emmanuel Rodolphe)
- Agassiz, Elizabeth Cabot
- Agassiz, Lake
- agate
- Agate Fossil Beds National Monument
- Agate, James (Evershed)
- agateware
- Agatha, SAINT
- Agathias
- Agathis
- Agatho, SAINT
- Agathocles
- Agathon
- Agau
- Agavaceae
- Agazzari, Agostino
- Agboville
- age distribution
- age set
- Age, The
- age-area hypothesis
- Agee, James
- Ageladas
- Agen
- Agenais
- Agence France-Presse
- agency
- agenesis
- Agent Orange
- Ageo
- ageratum
- Agesander
- Agesilaus II
- Agfa-Gevaert Group
- agglomerate
- agglutinate
- agglutination
- agglutinin
- aggregate
- aggression
- aggressive behaviour
- aggressive mimicry
- Agha Mohammad Khan
- Aghlabid DYNASTY
- Agin-Buryatiya
- Agincourt, Battle of
- aging
- Aginskoye
- Agis I
- Agis II
- Agis III
- Agis IV
- agitprop
- Aglauros
- Agnano
- Agnatha
- Agnelli, Giovanni
- Agnelli, Umberto
- Agnes OF POITOU
- Agnes, SAINT
- Agnesi, Maria Gaetana
- Agnew, Spiro T(heodore)
- Agni
- Agnihotri, Shiv Narayan
- Agnon, Shmuel Yosef
- agnosticism
- Agnostus
- Agnus Dei
- Agobard, SAINT
- agon
- agonism
- agora
- Agoracritus
- Agostino DI DUCCIO
- Agostino DI GIOVANNI
- Agoult, Marie (-Catherine-Sophie) de Flavigny, comtesse d'
- agouti
- Agra
- Agramonte y Simoni, Aristides
- agranulocytosis
- Agrarian League
- Agreda, María de
- Agri
- Agri Decumates
- agribusiness
- Agricola, Alexander
- Agricola, Georgius
- Agricola, Gnaeus Julius
- Agricola, Johann
- Agricola, Martin
- Agricola, Rodolphus
- Agricultural Adjustment Administration
- agricultural economics
- agricultural sciences
- agriculture
- Agrigento
- Agrihan
- agrimony
- Agrínion
- Agrionia
- Agrippa
- Agrippa von Nettesheim, Heinrich Cornelius
- Agrippa, Marcus Vipsanius
- Agrippina THE ELDER
- Agrippina THE YOUNGER
- agrostology
- Aguadilla
- Aguán River
- Aguarico River
- Aguascalientes
- Aguesseau, Henri-François d'
- Aguilar, Grace
- Aguinaldo, Emilio
- Aguirre, Lope de
- Agulhas Current
- Agulhas, Cape
- agunah
- Agung
- Agung, Abulfatah
- Agung, Mount
- Agusan River
- Agustini, Delmira
- Ah Kin
- Aha OF SHABHA
- Ahab
- Ahad Ha'am
- Ahaggar
- ahankara
- Ahaz
- Ahenobarbus, Gnaeus Domitius
- Ahenobarbus, Lucius Domitius
- Ahhiyawa
- Ahidjo, Ahmadou
- Ahikar, The Story of
- ahimsa
- Ahir
- Ahithophel
- Ahl al-Kitab
- Ahl-e Haqq
- Ahlin, Lars
- Ahmad
- Ahmad al-Mansur
- Ahmad Baba
- Ahmad Grañ
- Ahmad ibn Hanbal
- Ahmad ibn Tulun
- Ahmad ibn Tulun, Mosque of
- Ahmad Khan, Sir Sayyid
- Ahmad Musa
- Ahmad Shah
- Ahmad Shah Durrani
- Ahmad Sirhindi, SHAYKH
- Ahmadabad
- Ahmadi, al-
- Ahmadiyah
- Ahmadnagar
- Ahmadu Seku
- Ahmed Hasim
- Ahmed I
- Ahmed II
- Ahmed III
- Ahmed Vefik Pasa
- Ahmed Yesevi
- Ahmed, Fakhruddin Ali
- Ahmedi, Taceddin
- Ahmet Pasa Bursali
- Ahmose I
- Ahmose II
- Aho, Juhani
- aholehole
- Ahom
- Ahram, Al-
- Ahriman
- Ahsa`i, al-
- Ahuachapán
- Ahuitzotl
- Ahura Mazda
- Ahvaz
- ai
- Ai Qing
- Aicard, Jean
- Aichbühl
- Aichi
- Aichinger, Gregor
- aid
- Aidan
- Aidan, SAINT
- aide-de-camp
- Aidoo, Ama Ata
- AIDS
- aigrette
- Aigues-Mortes
- Aiguillon, Emmanuel-Armand (de Vignerot du Plessis) de Richelieu, duc d'
- Aiken
- Aiken, Conrad (Potter)
- Aiken, Howard Hathaway
- aikido
- aileron
- Ailey, Alvin, Jr.
- Ailly, Pierre d'
- Aimard, Gustave
- Aimoin
- Aimorés Mountains
- Ain
- Aïn Beïda
- Ain River
- Aïn Sefra
- Aïn Temouchent
- Ainsworth, Henry
- Ainsworth, William Harrison
- Ainu
- air
- air brake
- Air Canada
- air de cour
- air embolism
- air force
- Air France
- air gun
- air law
- air lock
- air mass
- Aïr massif
- air pocket
- air racing
- air sac
- air space
- air spring
- air warfare
- air-conditioning
- air-cushion machine
- Air-India
- air-sea interface
- air-traffic control
- Airbus Industrie
- aircraft carrier
- Airedale terrier
- airfoil
- airframe
- airglow
- airmail
- airplane
- airport
- Airport art
- airship
- airspeed indicator
- Airy, Sir George Biddell
- Aisén
- aisle
- Aisne
- Aistis, Jonas
- Aitken, John
- Aitken, Robert Grant
- Aix-en-Provence
- Aix-la-Chapelle, Congress of
- Aix-la-Chapelle, Treaty of
- Aix-Marseille I, II, and III, Universities of
- Aizawa Yasushi
- Aizawl
- Aizu-wakamatsu
- Ajaccio
- Ajanta Caves
- Ajaria
- Ajax
- Ajdukiewicz, Kazimierz
- ajiva
- Ajivika
- 'Ajjul, Tall al-
- Ajka
- 'Ajman
- Ajmer
- Ajo
- Ak Koyunlu
- AK-47
- Akademgorodok
- Akademiya Nauk Range
- Akaka Falls
- Akal Takht
- Akali
- Akan
- Akan states
- Akaroa
- Akashi
- Akashic record
- Akbar
- Akbar period architecture
- Akebia
- akee
- Akeley, Carl (Ethan)
- Akenside, Mark
- åkermanite
- Akershus
- akh
- Akhdar Mountains
- Akhenaton
- Akhisar
- Akhlame
- Akhmadulina, Bella
- Akhmatova, Anna
- Akhmim
- Akhtal, al-
- Akiba ben Joseph
- Akihito
- Akimov, Nikolay Pavlovich
- Akindynos, Gregorios
- akita
- Akkad
- Akkadian language
- 'Akko
- Aklavik
- Ako
- Akola
- Akosombo Dam
- Akranes
- akriyavada
- Akron
- Akron, University of
- Akrotiri
- aksak
- Aksakov, Sergey Timofeyevich
- Akselrod, Pavel Borisovich
- Akshak
- Aksobhya
- Aksum
- Aksyonov, Vasily Pavlovich
- Aktyubinsk
- akund floss
- Akure
- Akureyri
- Akutagawa Ryunosuke
- Akwa Ibom
- Akwamu
- Akwapim-Togo Ranges
- Al Bu Sa'id DYNASTY
- Al Wahibah Dunes
- al-
- al-'Arab, Shatt
- al-'Arabah, Wadi
- al-Fujayrah
- Ala Shan Desert
- Ala'ud'din
- Alabama
- Alabama claims
- Alabama Platform
- Alabama River
- Alabama State University
- Alabama, University of
- alabaster
- Alabaster, William
- alabastron
- Alaca Hüyük
- Aladdin
- Aladura
- Alagoas
- Alagoinhas
- Alain
- Alain DE LILLE
- Alain-Fournier
- Alajuela
- Alakol, Lake
- Alalakh
- Alamán, Lucas
- Alameda
- Alamein, battles of el-
- 'Alamgir II
- Alamo
- Alamogordo
- Alamosa
- Alanbrooke (of Brookeborough), Alan Francis Brooke, 1st Viscount, BARON ALANBROOKE OF BROOKEBOROUGH
- Åland Islands
- Alani
- alanine
- alapa
- Alapayevsk
- Alarcón y Ariza, Pedro Antonio de
- Alarcos, Battle of
- Alaric
- Alaric II
- alarm signal
- Alas (y Ureña), Leopoldo
- Alasehir
- Alaska
- Alaska blackfish
- Alaska Current
- Alaska Highway
- Alaska Peninsula
- Alaska Purchase
- Alaska Range
- Alaska, Gulf of
- Alaska, University of
- Alaskan brown bear
- Alaskan Malamute
- Alatri
- Alaungpaya
- Alaungpaya DYNASTY
- Álava
- 'Alawite
- alaya-vijñana
- alb
- alba
- Alba Fucens
- Alba Iulia
- Alba Longa
- Alba, Fernando Álvarez de Toledo y Pimentel, 3{sup er} duque de
- Albacete
- albacore
- Albalag, Isaac
- Alban Hills
- Alban, SAINT
- Albani, Francesco
- Albania
- Albanian language
- Albanian League
- Albanian literature
- Albano, Lake
- Albany
- Albany Congress
- Albany River
- Albany, Alexander Stewart, duke of
- Albany, John Stewart, 2nd duke of
- Albany, Louise Maximilienne Caroline, Countess of
- Albany, Robert Stewart, 1st duke of
- albarello
- albatross
- albedo
- Albee, Edward (Franklin)
- Albee, Edward Franklin
- Albemarle Sound
- Albéniz, Isaac (Manuel Francisco)
- Alberdi, Juan Bautista
- Alberoni, Giulio
- Albers, Josef
- Albert
- Albert Canal
- Albert I
- Albert II
- Albert II Alcibiades
- Albert III
- Albert III Achilles
- Albert L'OUVRIER
- Albert Lea
- Albert Nile
- Albert OF AIX
- Albert OF SAXONY
- Albert VII
- Albert, ARCHDUKE
- Albert, Eugen (Francis Charles) d'
- Albert, Heinrich
- Albert, Lake
- Albert, PRINCE CONSORT OF GREAT BRITAIN AND IRELAND
- Alberta
- Alberta Basin
- Alberti FAMILY
- Alberti, Domenico
- Alberti, Leon Battista
- Alberti, Rafael
- Albertina Graphics Collection
- Albertinelli, Mariotto
- Albertini, Luigi
- Albertosaurus
- Albertus MAGNUS, SAINT
- Albery FAMILY
- Albi
- Albigenses
- albinism
- Albino
- Albinoni, Tomaso Giovanni
- Albinovanus Pedo
- Albinus
- Albinus, Bernard Siegfried
- Albinus, Decimus Clodius Septimius
- Albion
- Albion College
- albite
- Albizia
- Albo, Joseph
- Alboin
- Alboni, Marietta
- Ålborg
- Albornoz, Gil Álvarez Carrillo de
- Albrechtsberger, Johann Georg
- Albret FAMILY
- Albright's syndrome
- Albright, Ivan (Le Lorraine)
- Albright, Tenley (Emma)
- Albright, W.F.
- Albright-Knox Art Gallery
- Albula Alps
- album
- Albumazar
- albumen paper
- albumin
- Albuquerque
- Albuquerque, Afonso de, THE GREAT
- Albury-Wodonga
- Alcaeus
- alcaic
- Alcalá de Guadaira
- Alcalá de Henares
- Alcalá Zamora, Niceto
- Alcalá, Calle de
- alcalde
- Alcamenes
- Alcamo
- Alcan Aluminium Limited
- Alcántara
- Alcántara, Order of
- Alcaraz carpet
- Alcatraz Island
- alcázar
- Alcázar de San Juan
- alchemy
- Alchevsk
- Alcibiades
- Alcidae
- Alcidamas
- Alcinous
- Alciphron
- Alcithoë
- alclad
- Alcmaeon
- Alcmaeonid FAMILY
- Alcman
- Alcoa
- Alcobaça
- Alcock, John
- Alcock, Sir John William
- alcohol
- alcoholic beverage
- Alcoholics Anonymous
- alcoholism
- Alcor
- Alcott, (Amos) Bronson
- Alcott, Louisa May
- alcove
- Alcoy
- Alcuin
- Aldabra Islands
- Aldan River
- Aldanov, Mark
- Aldebaran
- Aldecoa, Ignacio
- aldehyde
- Alden, John
- alder
- alder buckthorn
- Alder, Kurt
- alderfly
- alderman
- Alderney
- Aldfrith
- Aldhelm
- Aldington, Richard
- Aldiss, Brian W(ilson)
- aldosterone
- Aldrich, Nelson W(ilmarth)
- Aldrich, Robert
- Aldrich, Thomas Bailey
- Aldridge, Ira Frederick
- aldrin
- Aldrin, Edwin Eugene, Jr.
- Aldrovandi, Ulisse
- ale
- Aleandro, Girolamo
- Aleardi, Aleardo, Conte
- aleatory dance
- aleatory music
- Alecsandri, Vasile
- Alegrete
- Alegría, Ciro
- Aleijadinho
- Aleixandre, Vicente
- Alekhine, Alexander
- Aleksandriya
- Aleksandrov, Pavel Sergeevich
- Aleksandrovsk-Sakhalinsky
- Alekseyev, Mikhail Vasilyevich
- Alekseyev, Vasily Ivanovich
- Aleksin
- Alemán, Mateo
- Alemán, Miguel
- Alemanni
- Alembert, Jean Le Rond d'
- Alencar, José (Martiniano) de
- Alençon
- Alençon lace
- Aleni, Giulio
- Alentejo
- 'alenu
- Aleppo
- alerce
- Alès
- Alesia
- Alessandri Palma, Arturo
- Alessandria
- Alessandro
- Ålesund
- Aleut
- Aleut language
- Aleutian Basin
- Aleutian Islands
- Aleutian Range
- alewife
- Alexander
- Alexander (of Tunis), Harold (Rupert Leofric George) Alexander, 1st Earl
- Alexander (V)
- Alexander AETOLUS
- Alexander Archipelago
- Alexander BALAS
- Alexander City
- Alexander I
- Alexander I, SAINT
- Alexander II
- Alexander III
- Alexander Island
- Alexander IV
- Alexander NEVSKY, SAINT
- Alexander OF APHRODISIAS
- Alexander OF HALES
- Alexander OF PHERAE
- Alexander OF TRALLES
- Alexander POLYHISTOR
- Alexander romance
- Alexander THE PAPHLAGONIAN
- Alexander VI
- Alexander VII
- Alexander VIII
- Alexander, Dorothy
- Alexander, Franz (Gabriel)
- Alexander, Grover Cleveland
- Alexander, James W., II
- Alexander, Samuel
- Alexanderson, Ernst F.W.
- Alexandra
- Alexandria
- Alexandria Municipal Museum
- Alexandria, Library of
- Alexandria, School of
- Alexandria, Synod of
- Alexandrian rite
- Alexandrina, Lake
- alexandrine
- Alexandrist
- Alexandroúpolis
- Alexeïeff, Alexandre
- Alexis
- Alexis I
- Alexis II
- Alexis, SAINT
- Alexis, Willibald
- Alexius I COMNENUS
- Alexius II COMNENUS
- Alexius III ANGELUS
- Alexius IV ANGELUS
- Alexius V DUCAS MURTZUPHLUS
- Alfa Romeo SpA
- alfalfa
- alfalfa weevil
- Alfasi, Isaac ben Jacob
- Alfieri, Vittorio, Conte
- alfisol
- Alfonsín, Raúl
- Alfonsine Tables
- alfonsino
- Alfonso I
- Alfonso II
- Alfonso III
- Alfonso IV
- Alfonso IX
- Alfonso V
- Alfonso VI
- Alfonso VII
- Alfonso VIII
- Alfonso X
- Alfonso XI
- Alfonso XII
- Alfonso XIII
- Alfred
- Alfred Jewel
- Alfred University
- Alfvén, Hannes (Olof Gösta)
- alga
- Algardi, Alessandro
- Algarotti, Francesco
- Algarve
- algebra
- algebraic equation
- algebraic geometry
- algebraic number
- algebraic surface
- Algeciras
- Algeciras Conference
- Alger OF LIÈGE
- Alger, Horatio
- Algeria
- Algerian Reformist Ulama, Association of
- Alghero
- Algiers
- Algirdas
- Algol
- algology
- Algonquian languages
- Algonquin
- Algonquin Provincial Park
- Algonquin Round Table
- Algonquin, Lake
- algorithm
- Algren, Nelson
- Alhambra
- Alhazen
- Alhucemas
- 'Ali
- 'Ali ar-Rida
- 'Ali Bey
- Ali Haji bin Raja Amhad, Raja
- Ali Pasa Tepelenë
- Âli Pasa, Mehmed Emin
- Ali, Muhammad
- Alia, Ramiz
- Aliákmon River
- Alicante
- alicatado
- Alice
- Alice Springs
- alicyclic compound
- alien
- Alien and Sedition Acts
- alienation
- alienation effect
- Aligarh
- alignment
- alimentary canal
- alimentary paste
- alimony
- Alinagar, Treaty of
- Alinsky, Saul (David)
- aliphatic compound
- Alipore
- Alipur Duar
- Aliquippa
- Alisar Hüyük
- Alismatales
- Alismatidae
- Alitalia-Linee Aeree Italiane
- aliyah
- alizarin
- alka
- Alkalai, Judah ben Solomon Hai
- alkali
- alkali feldspar
- alkali flat
- alkali metal
- alkaline phosphatase
- alkaline-earth metal
- alkaloid
- alkalosis
- Alkan, (Charles-Henri-) Valentin
- alkanet
- alkaptonuria
- Alkmaar
- alkylation
- All Nippon Airways Co., Ltd.
- All Saints' Day
- All Souls' Day
- All-America team
- All-England Championships
- All-Fours
- All-India Trade Union Congress
- all-or-none law
- All-Star Game
- All-Union Council of Evangelical Christians and Baptists
- Allah
- Allahabad
- Allais, Maurice
- Allan, Maud
- Allan, Sir Hugh
- allantois
- Allbutt, Sir Thomas Clifford
- allée
- Allee, Warder Clyde
- Allegany
- Alleghenian orogeny
- Allegheny
- Allegheny College
- Allegheny Mountains
- Allegheny Plateau
- Allegheny River
- allegory
- Allégret, Marc
- allele
- allemande
- allemontite
- Allen, Bog of
- Allen, Ethan
- Allen, Fred
- Allen, George (Herbert)
- Allen, Hervey
- Allen, Richard
- Allen, Sir Hugh (Percy)
- Allen, Sir James
- Allen, Steve
- Allen, Viola (Emily)
- Allen, William
- Allen, Woody
- Allenby (of Megiddo and of Felixstowe), Edmund Henry Hynman Allenby, 1st Viscount
- Allende (Gossens), Salvador
- Allentown
- Alleppey
- Allerdale
- allergen
- allergy
- Allerød
- Alleyn, Edward
- Allgemeine Enzyklopädie der Wissenschaften und Künste
- Allgemeine Zeitung
- Allgood, Sara
- Alliaceae
- alliance
- Alliance for Progress
- Allied Powers
- Allied-Signal Inc.
- Allier
- Allier River
- alligator
- alligator apple
- Alligator Rivers
- Alliluyeva, Svetlana
- Allingham, Margery (Louise)
- Allison, William B.
- alliteration
- alliterative verse
- Allobroges
- allodium
- allophone
- allopurinol
- Allosaurus
- allosteric control
- allotropy
- Allouez, Claude-Jean
- Alloway
- alloy
- Allport, Gordon W(illard)
- allspice
- Allston, Robert (Francis Withers)
- Allston, Washington
- alluvial fan
- alluvium
- Alma
- Alma, Battle of the
- Alma-Ata
- Alma-Tadema, Sir Lawrence
- Almadén
- Almagest
- Almagro, Diego de
- Almalyk
- almanac
- almandine
- Almansa Dam
- Almeida, Francisco de
- Almeida, José Américo de
- Almeida, José Valentim Fialho de
- Almeida, Lourenço de
- Almeida, Manuel Antônio de
- Almelo
- Almendares River
- Almendros, Nestor
- Almería
- Almetyevsk
- Almirante Brown
- Almohads
- Almon, John
- almond
- Almond, Gabriel A(braham)
- almoner
- almonry school
- Almora
- Almoravids
- Almqvist, Carl Jonas Love
- almshouse
- almucantar
- Alness
- alnico
- Alnwick
- Aload
- Aloe
- Alonso, Dámaso
- Alor Islands
- Alor Setar
- Aloysius GONZAGA, SAINT
- Alp-Arslan
- alpaca
- Alpenrhein River
- Alpes-de-Haute-Provence
- Alpes-Maritimes
- Alpha and Omega
- Alpha Centauri
- Alpha Crucis
- alpha decay
- alpha particle
- alphabet
- alphabet rhyme
- Alpheus River
- Alphonsus
- alphorn
- Alpine
- Alpine lakes
- Alpine local race
- Alpine orogeny
- Alpine skiing
- Alpini, Prospero
- Alps
- Alpujarra rug
- alpwirtschaft
- Als
- Alsace
- Alsace-Lorraine
- Alsop, Joseph
- Alster River
- Alston, Walter (Emmons)
- alstonite
- Altai Mountains
- Altaic languages
- Altair
- Altaisky Nature Reserve
- Altamira
- Altamura
- Altan
- altar
- Altare glass
- altarpiece
- Altay
- Altdorf
- Altdorfer, Albrecht
- Altenburg
- alternating current
- alternation of generations
- Altgeld, John Peter
- Althiburos
- Althusius, Johannes
- Altichiero
- altimeter
- Altiplano
- Altis
- altitude and azimuth
- altitude sickness
- Altizer, Thomas J(onathan) J(ackson)
- Altman, Benjamin
- Altman, Robert (B.)
- Altman, Sidney
- alto
- Alton
- Altona
- Altoona
- Altranstädt, treaties of
- altruism
- Altus
- Aluko, T(imothy) M(ofOlorunso)
- alum
- Alumbrado
- alumina
- aluminum
- aluminum bronze
- Aluminum Company of America
- alunite
- alunogen
- Alushta
- Alvar
- Alvarado, Pedro de
- Álvarez Quintero, Serafín and Joaquín
- Álvarez, Juan
- Alvarez, Luis W(alter)
- Alvear, Marcelo T(orcuato) de
- Alvensleben-Erxleben, Gustav, Graf von
- alveolar proteinosis
- Älvsborg
- Alwar
- Alyattes
- Alyn and Deeside
- Alypius
- Alytus
- Alzheimer's disease
- Alzira
- Alzon, Emmanuel d'
- AM
- Amadeus
- Amadeus Quartet
- Amadeus VI
- Amadeus VII
- Amadeus VIII
- Amadeus, Lake
- Amadi, Elechi
- Amadís of Gaul
- Amado, Jorge
- Amagasaki
- amakihi
- Amakusa Archipelago
- Amalaric
- Amalasuntha
- Amalekite
- Amalfi
- amalgam
- Amalgamated Clothing and Textile Workers Union
- Amalgamated Engineering and Electrical Union
- Amalienborg
- Amalric I
- Amalric II
- Amalthaea
- Amalthea
- Amambaí Mountains
- Amami Great Island
- Amana Colonies
- Amanita
- Amanollah Khan
- Amapá
- Amar Das
- Amara, Lucine
- 'Amarah, al-
- Amaranthaceae
- Amarapura
- Amaravati
- Amaravati sculpture
- Amargosa Range
- Amarillo
- Amarna style
- Amarna, Tell el-
- Amaryllidaceae
- Amasis Painter
- Amasya
- Amaterasu
- Amateur Athletic Association
- Amateur Athletic Union of the United States
- amateur radio
- Amathus
- Amati FAMILY
- Amatique Bay
- Amatitlán, Lake
- Amazon
- Amazon Rain Forest
- Amazon River
- Amazonas
- amazonstone
- Amb
- Ambala
- Ambartsumian, Viktor
- ambassador
- Ambato
- Ambedkar, Bhimrao Ramji
- amber
- Amber Valley
- Amberg
- ambergris
- amberina glass
- amberjack
- ambiguity
- Ambikapur
- Ambler, Eric
- amblygonite
- amblyopia
- ambo
- Amboina Massacre
- Amboise
- Amboise, Conspiracy of
- Amboise, Georges d'
- Ambon
- Amboseli National Park
- Ambridge
- Ambros, August Wilhelm
- Ambrose OF CAMALDOLI
- Ambrose, SAINT
- Ambrosian chant
- Ambrosiaster
- Ambrym
- ambulatory
- ambush bug
- Amda Tseyon
- Ameghino, Florentino
- Amelanchier
- Amelung glass
- amen
- Amendola, Giovanni
- Amenemhet I
- Amenemhet II
- Amenemhet III
- Amenemope
- Amenhotep I
- Amenhotep II
- Amenhotep III
- Amenhotep, SON OF HAPU
- amenorrhea
- Amenouzume
- amensalism
- Amer
- Amerada Hess Corporation
- amercement
- America First Committee
- America NT & SA, Bank of
- America's Cup
- American Academy of Arts and Sciences
- American Airlines, Inc.
- American Anti-Slavery Society
- American arborvitae
- American Association for the Advancement of Science
- American Ballet
- American Ballet Theatre
- American Baptist Association
- American Baptist Churches in the U.S.A.
- American Bar Association
- American Basketball Association
- American Bible Society
- American Board of Commissioners for Foreign Missions
- American Brands, Inc.
- American Broadcasting Company
- American Civil Liberties Union
- American Civil War
- American Colonization Society
- American Coloured local race
- American Dictionary of the English Language, An
- American Evangelical Lutheran Church
- American Express Company
- American Farm Bureau Federation
- American Federation of Labor-Congress of Industrial Organizations
- American Football League
- American Friends Service Committee
- American Fur Company
- American Hebrew Congregations, Union of
- American Highland
- American Indian
- American Indian geographical race
- American Indian languages
- American Indian Movement
- American Labor Party
- American League
- American Legion
- American Lutheran Church
- American Medical Association
- American Mercury
- American Missionary Association
- American Motors Corporation
- American Museum of Natural History
- American Philosophical Society
- American Protective Association
- American Quarter horse
- American Renaissance
- American round
- American Saddlebred horse
- American Samoa
- American States, Organization of
- American Stock Exchange
- American Telephone & Telegraph Company
- American University, The
- American yew
- Americana
- Americanism
- Americanization
- Americas
- Americas, pony of the
- americium
- Americus
- Amersfoort
- Amersham
- Amery Ice Shelf
- Amery, L(eopold Charles Maurice) S(tennett)
- Ames
- Ames, Fisher
- Ames, Leslie
- Ames, Oakes
- Ames, William
- Ames, Winthrop
- Amesbury
- amesha spenta
- amethyst
- Ameura
- Amhara
- Amhara Plateau
- Amharic language
- Amherst
- Amherst (of Arracan), William Pitt Amherst, lst Earl, VISCOUNT HOLMESDALE, BARON AMHERST OF MONTREAL
- Amherst College
- Amherst, Jeffrey Amherst, lst Baron
- Amhurst, Nicholas
- Ami
- amice
- Amici, Giovanni Battista
- amicus curiae
- amidah
- amide
- Amidism
- Amiel, Henri Frédéric
- Amiens
- Amiens, Treaty of
- 'Amili, Baha` ad-Din Muhammad ibn Husayn, al-
- Amin, (Muhammad) al-
- Amin, Idi
- amine
- amino acid
- Amir Ali, Sayyid
- Amir Khosrow
- Amirante Isles
- 'Amiriyah, al-
- Amis and Amiles
- Amis, Kingsley
- Amish
- Amitabha
- Amitayur-dhyana-sutra
- Amiternum
- Amman
- Amman, Jost
- Ammann, Othmar Herman
- Ammannati, Bartolommeo
- Ammassalik
- ammeter
- Ammianus Marcellinus
- ammonia
- ammonia-soda process
- Ammonite
- ammonium chloride
- ammonium hydroxide
- ammonium nitrate
- Ammonius HERMIAE
- ammonoid
- ammunition
- amnesia
- amnesty
- Amnesty International
- amniocentesis
- amnion
- Amoco Corporation
- amodiaquine
- amoeba
- Amoghasiddhi
- Amol
- Amon
- Amontons, Guillaume
- amora
- Amorbach
- Amorgós Island
- Amorite
- Amorite language
- Amoroso Lima, Alceu
- amortization
- Amory, Thomas
- Amos
- Amos, Book of
- amosite
- Amoy
- ampere
- Ampère's law
- Ampère, André-Marie
- Ampère, Jean-Jacques (-Antoine)
- amphetamine
- amphibian
- amphibious vehicle
- amphibious warfare
- amphibole
- amphibole asbestos
- amphibolite
- amphibolite facies
- amphictyony
- Amphion and Zethus
- amphioxus
- amphipod
- Amphipolis
- Amphissa
- amphitheatre
- Amphitherium
- Amphitrite
- Amphitryon
- amphiuma
- amphora
- amphoterism
- ampicillin
- amplifier
- amplitude
- amplitude modulation
- Ampthill
- Ampthill (of Ampthill), Odo William Leopold Russell, 1st Baron
- ampulla
- amputation
- 'Amr ibn al-'As
- 'Amr ibn al-'As, Mosque of
- 'Amr ibn Kulthum
- Amram bar Sheshna
- Amratian culture
- Amravati
- Amreli
- Amritsar
- Amritsar, Massacre of
- Amritsar, Treaty of
- Amroha
- Amrouche, Jean
- Amrouche, Marguerite Taos
- Amsdorf, Nikolaus von
- Amstelveen
- Amsterdam
- Amsterdam-Rhine Canal
- Amstetten
- Amtrak
- Amu Darya
- Amud remains
- amulet
- Amundsen Gulf
- Amundsen, Roald
- 'Amuq
- Amur
- Amur River
- Amursk
- Amuzgo
- amygdule
- amyl alcohol
- amylase
- amyloidosis
- Amyntas III (or II)
- Amyot, Jacques
- amyotrophic lateral sclerosis
- Amyrtaeus OF SAIS
- An Chung-sik
- An Lu-shan
- An-ch'ing
- An-k'ang
- An-p'ing
- An-shan
- An-shun
- An-yang
- Anabaena
- Anabaptist
- Anabasis
- anabatic wind
- anabolism
- Anacardiaceae
- anachronism
- Anacletus (II)
- Anacletus, SAINT
- anaconda
- Anaconda Company
- Anacreon
- Anadarko
- Anadyr
- Anadyr, Gulf of
- Anagni
- anagnorisis
- anagram
- 'Anah
- Anaheim
- Anahiti
- Anáhuac
- Anai Peak
- Anaimalai Hills
- anal canal
- anal stage
- analcime
- analgesia
- analgesic
- analog computer
- analogy
- analysis
- analytic geometry
- analytic language
- Analytic philosophy
- analytic proposition
- analytic psychology
- Anambra
- anamorphosis
- Anan
- Anan ben David
- Anand, Mulk Raj
- ananda
- Ananda Bazar Patrika
- Ananda Mahidol
- Ananke
- Anantapur
- anantarika-karma
- Anantnag
- anapest
- anaphora
- anaphylaxis
- Anápolis
- anarchism
- anasarca
- Anasazi culture
- Anastasia
- Anastasia, Albert
- Anastasius I
- Anastasius I, SAINT
- Anastasius II
- Anastasius III
- Anastasius IV
- Anastasius SINAITA, SAINT
- Anastasius THE LIBRARIAN
- anastatic printing
- anatase
- anatexis
- Anath
- anathema
- Anatidae
- Anatolia
- Anatolian languages
- Anatom
- anatomy
- Anatosaurus
- anatta
- anauxite
- Anawrahta
- Anaxagoras
- Anaximander
- Anaximenes OF MILETUS
- Anazarbus
- Anbar
- Ancaeus
- ancestor worship
- Anchieta, José de
- Anchises
- anchor
- Anchorage
- anchovy
- anchovy pear
- Anchura
- ancient lights
- ancients and moderns
- Ancillon, Charles
- Ancillon, Johann Peter Friedrich
- Anckarsvärd, Carl Henrik, Greve
- Ancón
- Ancona
- Ancud
- Ancus Marcius
- And Fjord
- Andalusia
- andalusite
- Andaman and Nicobar Islands
- Andaman Islands
- Andaman Sea
- Andamanese
- Andamanese language
- Andania mysteries
- Andean civilization
- Andean Geosyncline
- Andean Group
- Anderlecht
- Anders, William A(lison)
- Anders, Wladyslaw
- Andersen's disease
- Andersen, Hans Christian
- Andersen, Tryggve
- Anderson
- Anderson, Carl David
- Anderson, Dame Judith
- Anderson, Elizabeth Garrett
- Anderson, John Henry
- Anderson, Lindsay
- Anderson, Marian
- Anderson, Mary
- Anderson, Maxie
- Anderson, Maxwell
- Anderson, Philip W.
- Anderson, Richard Heron
- Anderson, Sherwood
- Andersonville
- Anderssen, Adolf
- Andersson, Dan(iel)
- Andersson, Johan Gunnar
- Andes Mountains
- andesite
- Andhra Pradesh
- andiron
- Andizhan
- Ando Shoeki
- Andocides
- Andong
- Andorra
- Andorra-la-Vella
- Andover
- Andrada e Silva, José Bonifácio de
- Andrade, Mário de
- Andrade, Mário Pinto de
- Andrade, Oswald de
- andradite
- Andrássy, Gyula, Count
- André LE CHAPELAIN
- André, John
- Andrea DA BARBERINO
- Andrea DA FIRENZE
- Andrea DEL SARTO
- Andreani, Andrea
- Andreanof Islands
- Andreas-Salomé, Lou
- Andreini, Francesco
- Andreini, Giovambattista
- Andreini, Isabella
- Andreis, Felix de
- Andreotti, Giulio
- Andretti, Mario
- Andrew I
- Andrew II
- Andrew OF CAESAREA
- Andrew OF CARNIOLA
- Andrew OF CRETE, SAINT
- Andrew OF LONJUMEL
- Andrew, John Albion
- Andrew, SAINT
- Andrewes, Lancelot
- Andrews, Charles McLean
- Andrews, Dana
- Andrews, Frank M(axwell)
- Andrews, Roy Chapman
- Andrews, Thomas
- Andreyev, Leonid Nikolayevich
- Andria
- Andric, Ivo
- Androcles
- androgen
- Andromache
- Andromeda
- Andromeda Galaxy
- Andronicos, Manolis
- Andronicus I COMNENUS
- Andronicus II PALAEOLOGUS
- Andronicus III PALAEOLOGUS
- Andronicus IV PALAEOLOGUS
- Andronicus OF RHODES
- Andropov, Yury Vladimirovich
- Ándros
- Andros Island
- Andros, Sir Edmund
- Androscoggin River
- Andrusovo, Truce of
- Andrzejewski, Jerzy
- Andújar
- anechoic chamber
- Anegada Island
- Anegada Passage
- Aného
- Aneirin
- anemia
- anemometer
- anemone
- anemone fish
- Anerio, Felice
- anesthesiology
- anesthetic
- aneurysm
- Anezaki Masaharu
- Anfinsen, Christian B(oehmer)
- Ang
- Ang Thong
- anga
- Angad
- Angara River
- angaria
- Angarsk
- angary
- Ängby Stone
- angel
- Angel Falls
- Angela MERICI, SAINT
- Angeles
- Ángeles, Victoria de los
- angelfish
- angelica
- angelica tree
- Angelico, FRA
- Angell, Robert Cooley
- Angell, Sir Norman
- Angelo State University
- Angelus FAMILY
- Angelus SILESIUS
- Anger, Kenneth
- Angerman River
- Ångermanland
- Angers
- Angevin empire
- Angilbert
- angina pectoris
- angiocardiography
- angioedema
- angiography
- Angiolieri, Cecco
- Angiolini, Gasparo
- angioma
- angiosperm
- Angkor
- Angle
- anglerfish
- Anglesey, Isle of
- anglesite
- Angleterre
- Anglican chant
- Anglican Church of Australia
- Anglican Communion
- Anglican Evangelical
- Anglican religious community
- Anglin, Margaret (Mary)
- Anglo-Afghan Wars
- Anglo-America
- Anglo-Burmese Wars
- Anglo-Catholicism
- Anglo-Dutch Wars
- Anglo-Egyptian Condominium
- Anglo-Egyptian Treaty
- Anglo-Japanese Alliance
- Anglo-Norman literature
- Anglo-Saxon
- Anglo-Saxon art
- Anglo-Saxon Chronicle
- Anglo-Saxon law
- Ango, Jean
- Angol
- Angola
- Angora goat
- Angoulême
- Angoulême DYNASTY
- Angoulême, Charles de Valois, duc d'
- Angoulême, Louis-Antoine de Bourbon, duc d'
- Angoumois
- Angra do Heroísmo
- Angra dos Reis
- Angren
- Angry Young Men
- angstrom
- Ångström, Anders Jonas
- Anguier, François; and Anguier, Michel-André
- Anguilla
- anguilliform
- angular harp
- angular momentum
- angular velocity
- Angus
- Angus, Archibald Douglas, 6th Earl of
- Angus, Archibald Douglas, 8th Earl of, EARL OF MORTON
- Angus, William Douglas, 10th Earl of
- Anhalt
- Anhava, Tuomas
- Anheuser-Busch Companies, Inc.
- Anhwei
- anhydride
- anhydrite
- ani
- Aniakchak National Monument and Preserve
- anicca
- Anicetus, SAINT
- aniconism
- Anielewicz, Mordecai
- Aniene River
- Aniliidae
- aniline
- animal
- animal behaviour
- animal breeding
- animal communication
- animal interlace
- animal magnetism
- animal worship
- animals, cruelty to
- animals, master of the
- animation
- Animikie Series
- animism
- anion
- anise
- Anisian Stage
- anisotropy
- Anius
- Anjala League
- Anjo
- Anjou
- Anjou, (Hercule-) François, Duke (duc) d'
- Ankara
- Ankara, Battle of
- Ankara, Treaty of
- Ankaratra
- ankh
- Ankhesenamen
- ankle
- anklet
- Ankobra
- Ankylosaurus
- Ann Arbor
- Ann, Cape
- Anna
- Anna COMNENA
- Annaba
- Annaberg-Buchholz
- annabergite
- annalist
- Annam
- Annamese Cordillera
- Annandale and Eskdale
- Annapolis
- Annapolis Convention
- Annapolis Royal
- Annapurna
- annates
- annatto
- Anne
- Anne and Joachim, SAINTS
- Anne Arundel
- Anne BOLEYN
- Anne OF AUSTRIA
- Anne OF BRITTANY
- Anne OF CLEVES
- Anne OF DENMARK
- Anne OF FRANCE
- annealing
- Annecy
- annelid
- annexation
- Anniceris
- annihilation
- Anniston
- anno mundi
- Anno, SAINT
- Annonaceae
- annuity
- annulment
- Annunciation
- anode
- anodizing
- anointment
- anole
- anomalous water
- anomaly
- anomie
- Anomoean
- anorexia
- anorexia nervosa
- anorthite
- anorthoclase
- anorthosite
- Anouilh, Jean(-Marie-Lucien-Pierre)
- Anouk Aimée
- Anquetil-Duperron, A(braham)-H(yacinthe)
- Ansbach
- Anschluss
- Anselm OF CANTERBURY, SAINT
- Anselm OF LAON
- Anselm OF SAINT MARY
- Anser
- anseriform
- Ansermet, Ernest
- Ansett Transport Industries Limited
- Ansgar, SAINT
- Anshan
- Anshar and Kishar
- Ansky, S.
- Anson, Cap
- Anson, George Anson, Baron
- Ansongo
- Ansonia
- Anstey, Christopher
- ant
- ant bear
- anta
- antacid
- Antae
- Antaeus
- antagonism
- Antaimoro
- Antalya
- Antananarivo
- Antandroy
- 'Antar, Romance of
- Antarctic Circle
- Antarctic Circumpolar Current
- Antarctic Ocean
- Antarctic Peninsula
- Antarctic Treaty
- Antarctica
- Antares
- antbird
- anteater
- Antelami, Benedetto
- antelope
- antenna
- Antenor
- Antequera
- Anterus, SAINT
- Antheil, George
- anthelmintic
- anthem
- anthemion
- Anthemius
- Anthesteria
- Anthimus I
- Anthimus OF IBERIA
- Anthimus VI
- Anthimus VII TSATSOS
- anthomyiid fly
- Anthony Lagoon
- Anthony MELISSA
- Anthony OF BOURBON
- Anthony OF EGYPT, SAINT
- Anthony OF KIEV
- Anthony OF NOVGOROD
- Anthony OF PADUA, SAINT
- Anthony OF TAGRIT
- Anthony, Katharine (Susan)
- Anthony, Susan B.
- Anthony, William Arnold
- anthophyllite
- anthracene
- anthracite
- anthracnose
- anthracosis
- anthraquinone
- anthraquinone dye
- anthrax
- Anthropoidea
- anthropological linguistics
- anthropology
- anthropometry
- anthropomorphism
- anthroposophy
- Anthurium
- Anti-Atlas
- Anti-Comintern Pact
- Anti-Fascist Council for the National Liberation of Yugoslavia
- Anti-Federalists
- Anti-Lebanon Mountains
- Anti-Masonic Movement
- Anti-Saloon League
- anti-Semitism
- antiaircraft gun
- antiarch
- Antibes
- antibiotic
- antibody
- anticholinesterase
- Antichrist
- anticlericalism
- anticoagulant
- Anticosti Island
- anticyclone
- antidepressant
- antideuteron
- Antietam, Battle of
- antiferromagnetism
- antigen
- Antigone
- Antigonid DYNASTY
- Antigonish
- Antigonus I MONOPHTHALMUS
- Antigonus II GONATAS
- Antigonus III DOSON
- antigorite
- Antigua and Barbuda
- Antigua Guatemala
- antihistamine
- Antilles
- Antilles Current
- Antilochus
- antimacassar
- Antimachus OF COLOPHON
- antimatter
- antimetabolite
- antimicrobial agent
- antimonide
- antimony
- antimony poisoning
- Antin, Mary
- antineutrino
- antineutron
- antinomianism
- antinomy
- Antinoöpolis
- Antinoüs
- antinovel
- Antioch
- Antioch University
- Antioch, Council of
- Antioch, School of
- Antiochene rite
- Antiochus HIERAX
- Antiochus I SOTER
- Antiochus II THEOS
- Antiochus III
- Antiochus IV EPIPHANES
- Antiochus OF ASCALON
- Antiochus VII SIDETES
- Antiope
- Antioquia
- antioxidant
- antiparticle
- antipasto
- Antipater
- Antiphanes
- antiphon
- antiphonal singing
- Antipodes Islands
- Antipolo
- antipope
- antiproton
- antipyrine
- antique
- Antiquities of the Jews, The
- Antirent War
- antiseptic
- antiserum
- Antisthenes
- antitank weapon
- antithesis
- antitoxin
- antitrade wind
- antitrust law
- Antler orogeny
- antlerite
- antlike flower beetle
- antlion
- Antofagasta
- Antoine, André
- Antoku
- Antonelli, Giacomo
- Antonello DA MESSINA
- Antonescu, Ion
- Antonina
- Antonine
- Antonine Wall
- Antoninus Pius
- Antoninus, SAINT
- António, Mário
- Antonio, Nicolás
- António, PRIOR OF CRATO
- Antonioni, Michelangelo
- Antony Khrapovitsky
- Antony, Mark
- antpipit
- Antratsyt
- Antrim
- Antrim, Randal MacDonnell, Marquess and 2nd Earl of, VISCOUNT DUNLUCE
- Antsirabe
- Antsiranana
- Antwerp
- Antwerp Mannerists
- Antwerp Zoo
- antyesti
- Anu
- Anu, Chao
- Anuak
- Anubis
- anumana
- Anura
- Anuradhapura
- anus
- Anvari
- anvil
- Anville, Jean-Baptiste Bourguignon d'
- anxiety
- Anyang
- Anyi
- Anyte
- ANZAC
- Anzali, Bandar-e
- Anzengruber, Ludwig
- Anzhero-Sudzhensk
- Anziku, Kingdom of
- Anzilotti, Dionisio
- Anzio
- Anzoátegui
- ANZUS Pact
- Aoba
- Aomori
- Aornos, Siege of
- aorta
- aorta, coarctation of the
- aortic arch syndrome
- aortic insufficiency
- aortic stenosis
- Aosta
- aoudad
- Aouelloul Crater
- Aozou
- Apa Tani
- Apabhramsha language
- Apache
- Apadana
- Apalachee
- Apalachee Bay
- Apalachicola
- Apamea Cibotus
- Apanás, Lake
- apapane
- Apapocuva
- Aparri
- apartheid
- apartment house
- apathy
- apatite
- Apatosaurus
- Apaturia
- Apatzingán
- ape
- Apeldoorn
- apella
- Apelles
- Apellicon OF TEOS
- Apennine Range
- aperture
- Apgar Score System
- Apgar, Virginia
- Aphanomyces
- aphasia
- Aphek
- aphid
- aphorism
- Aphraates
- aphrodisiac
- Aphrodisias
- Aphrodite
- Aphthartodocetism
- Apia
- Apiaceae
- apicomplexan
- Apis
- Apizaco
- aplastic anemia
- aplite
- Apo, Mount
- apocalyptic literature
- apocalypticism
- Apocrita
- apocrypha
- Apocynaceae
- apodiform
- Apollinaire, Guillaume
- Apollinaris THE YOUNGER
- Apollo
- Apollo program
- Apollodorus
- Apollodorus OF ATHENS
- Apollodorus OF DAMASCUS
- Apollonius DYSCOLUS
- Apollonius OF PERGA
- Apollonius OF RHODES
- Apollonius OF TRALLES
- Apollonius OF TYANA
- Apollonius OF TYRE
- Apollonius THE ATHENIAN
- apologetics
- Apologist
- apology
- Apology of the Augsburg Confession
- apomixis
- aponeurosis
- apophyllite
- Apopis
- Apopis I
- aposematic mechanism
- aposiopesis
- apostasy
- Apostle
- Apostle Islands National Lakeshore
- apostle spoon
- Apostles' Creed
- Apostolic
- Apostolic Constitutions
- apostolic delegate
- Apostolic Father
- Apostolic Overcoming Holy Church of God
- apostolic succession
- apostome
- apothecaries' weight
- apotheosis
- apotropaic eye
- Appalachian Highlands
- Appalachian Mountains
- Appalachian National Scenic Trail
- Appalachian orogenic belt
- Appalachian Plateau
- Appaloosa
- appanage
- appeal
- Appeal, Court of
- Appel, Karel
- appendicitis
- appendix
- Appenzell
- Appenzell Ausser-Rhoden
- Appenzell Inner-Rhoden
- Appert, Nicolas (-François)
- appetizer
- Appia, Adolphe
- Appian OF ALEXANDRIA
- Appian Way
- apple
- apple moss
- Appleton
- Appleton layer
- Appleton, Sir Edward Victor
- application lace
- applied psychology
- appoggiatura
- Appomattox Court House
- Apponyi, Albert, Gróf
- apport
- apprenticeship
- apprenticeship novel
- approximant
- Apra Harbor
- apraxia
- Aprey faience
- apricot
- Apries
- April
- April Fools' Day
- April Theses
- apse
- apterygote
- Aptian Stage
- aptitude test
- Apuleius, Lucius
- Apure
- Apure River
- Apurímac
- Apurímac River
- Apuseni Mountains
- Aqa Mirak
- Aqaba, Gulf of
- 'Aqabah, al-
- Aqhat Epic
- 'aqil
- Aqmola
- 'Aqqad, 'Abbas Mahmud al-
- aqua regia
- aquaculture
- aquamarine
- aquarelle
- aquarium
- Aquarius
- aquatic locomotion
- aquatint
- aquavit
- Aquaviva, Claudio
- aqueduct
- aqueous humour
- aquifer
- Aquifoliaceae
- Aquila
- Aquileia
- Aquino
- Aquino, Benigno Simeon, Jr.
- Aquino, Corazon
- Aquitaine
- 'Ar'ar
- Ara
- Ara Pacis
- Arab
- Arab Bank for Economic Development in Africa
- Arab Economic Unity, Council of
- Arab Fund for Economic and Social Development
- Arab League
- Arab Legion
- Arab Monetary Fund
- Arab Petroleum Exporting Countries, Organization of
- Arab-Israeli wars
- arabesque
- Arabia
- Arabia Felix
- Arabian Basin
- Arabian Desert
- Arabian horse
- Arabian Sea
- Arabic alphabet
- Arabic language
- Arabic literary renaissance
- Arabic literature
- Aracaju
- aracari
- Araçatuba
- Arachne
- arachnid
- Arad
- 'Arafat, Yasir
- Arafura Sea
- Aragats, Mount
- Arago, François
- Aragon
- Aragon, Louis
- aragonite
- Aragua
- Araguaia River
- Araguari
- Arai Hakuseki
- Arakan
- Arakan Mountain Range
- Arakanese
- Arakcheyev, Aleksey Andreyevich, Graf
- Araki Sadao
- Aral Sea
- Arales
- Araliaceae
- Aram, Eugene
- Aramaean
- Aramaic alphabet
- Aramaic language
- Aran Islands
- Aranda
- Aranda, Pedro Pablo Abarca de Bolea, conde de
- Aranjuez
- Aransas National Wildlife Refuge
- Arany, János
- Aranyakas
- Arányi, Jelly d'
- Arao
- Arapaho
- Araraquara
- Ararat
- Ararat, Mount
- arartree
- Aras River
- Arason, Jón
- Aratus
- Aratus OF SICYON
- Arauca
- Arauca River
- Araucanía
- Araucanian
- Araucaria
- Arausio, Battle of
- Aravali Range
- Aravidu DYNASTY
- Arawa
- Arawak
- Arawakan languages
- arawana
- arba' kanfot
- Arbeau, Thoinot
- ARBED SA
- Arbenz (Guzmán), Jacobo
- Arber, Agnes
- Arber, Edward
- Arber, Werner
- arbitrage
- arbitration
- Arbogast
- arbor
- arboriculture
- arborvitae
- arbovirus
- Arbroath
- Arbuckle, Fatty
- Arbus, Diane
- Arbuthnot, John
- Arbutus
- Arc de Triomphe
- arc furnace
- arc lamp
- arc welding
- arcade
- Arcadelt, Jacob
- arcádia
- Arcadia, Academy of
- Arcadius
- arcanist
- Arcaro, Eddie
- Arcellinida
- Arcesilaus
- arch
- Arch, Joseph
- archaebacterium
- archaeocyathid
- archaeological time scale
- archaeology
- Archaeopteris
- Archaeopteryx
- Archaic culture
- Archaic period
- Archaic smile
- archangel
- archbishop
- archdeacon
- archduke
- Archean eon
- arched harp
- archegonium
- Archelaus
- Archelon
- archer fish
- Archer, Frederick
- Archer, Frederick Scott
- Archer, Thomas
- Archer, William
- archery
- Arches National Park
- archetype
- Archidamus I
- Archidamus II
- Archidamus III
- Archidamus IV
- Archidamus V
- Archilochus
- Archimedes screw
- Archimedes' principle
- archinephros
- archipallium
- archipelagic apron
- Archipenko, Alexander
- Architects Collaborative, The
- architecture
- architrave
- archives
- archivolt
- archlute
- Archon
- archosaur
- Archytas OF TARENTUM
- Arcimboldo, Giuseppe
- Arciniegas, Germán
- Arcos de la Frontera
- Arcot
- Arctic
- Arctic Circle
- Arctic fox
- Arctic Ocean
- Arctolepis
- Arcturus
- Arculf
- Arda River
- Ardabil
- Ardabil Carpet
- Ardagh Chalice
- Ardashir I
- Ardashir II
- Ardea
- Ardèche
- Arden, Eve
- Arden, John
- Ardennes
- Ardhanarishvara
- Ardmore
- Ards
- Arduino, Giovanni
- are
- Arecales
- Arecibo
- Arecibo Observatory
- Arecibo River
- Arecidae
- arena
- Arena Chapel
- Arenas, Reinaldo
- Arend-Roland, Comet
- Arendal
- Arendt, Hannah
- Arenig Series
- arenite
- Arensky, Anton (Stepanovich)
- Areopagus
- Arequipa
- Ares
- Aretaeus OF CAPPADOCIA
- arête
- Arethusa
- Aretino, Pietro
- Arevaci
- Arévalo (Bermejo), Juan José
- Arévalo Martínez, Rafael
- Arezzo
- Arfersiorfik Fjord
- Arfon
- Arfons, Art
- arfvedsonite
- argali
- Argall, Sir Samuel
- Argand burner
- Argand diagram
- Argead DYNASTY
- Argelander, Friedrich Wilhelm August
- Argens, Jean-Baptiste de Boyer, marquis d'
- Argenson, René-Louis de Voyer de Paulmy, marquis d'
- Argenta
- argentaffin cell
- Argentan lace
- Argenteuil
- Argentia
- Argentina
- Argentina, La
- argentine
- Argentine Basin
- Argentine Museum of Natural Sciences
- argentite
- Arges
- Arges River
- Arghun
- arginine
- Argolís
- Argolis, Gulf of
- argon
- Argonaut
- Argonne
- Argonne National Laboratory
- Argos
- Argostólion
- Arguedas, Alcides
- Arguedas, José María
- Arguin Island
- argument
- Argun River
- Argungu
- Argus
- Argus PANOPTES
- Argyle, Lake
- Argyll
- Argyll and Bute
- Argyll, Archibald Campbell, 10th Earl and 1st Duke of, MARQUESS OF KINTYRE AND LORNE, EARL OF CAMPBELL AND COWALL, VISCOUNT OF LOCHOW AND GLENYLA, LORD OF INVERARY, MULL, MORVERN, AND TIRIE
- Argyll, Archibald Campbell, 1st Marquess and 8th Earl of, LORD CAMPBELL, LORD LORNE, LORD OF KINTYRE
- Argyll, Archibald Campbell, 3rd Duke of, DUKE OF GREENWICH, MARQUESS OF KINTYRE AND LORNE, EARL OF CAMPBELL AND COWALL, EARL OF GREENWICH, VISCOUNT OF LOCHOW AND GLENYLA, BARON OF CHATHAM, EARL AND VISCOUNT OF ILAY, LORD OF INVERARY, MULL, MORVERN, AND TIRIE, LORD ORANSAY, DUNOON, AND ARASE
- Argyll, Archibald Campbell, 5th Earl of, LORD CAMPBELL, LORD LORNE
- Argyll, Archibald Campbell, 9th Earl of, LORD CAMPBELL, LORNE, AND KINTYRE
- Argyll, John Campbell, 2nd Duke of, DUKE OF GREENWICH, MARQUESS OF KINTYRE AND LORNE, EARL OF CAMPBELL AND COWALL, EARL OF GREENWICH, VISCOUNT OF LOCHOW AND GLENYLA, BARON OF CHATHAM, LORD OF INVERARY, MULL, MORVERN, AND TIRIE
- argyrodite
- arhat
- Århus
- Ari THORGILSSON THE LEARNED
- aria
- Ariadne
- Arianism
- Ariano Irpino
- Ariaramnes
- Arias (Madrid), Arnulfo
- Arias Dávila, Pedro
- Arias de Saavedra, Hernando
- Arias Navarro, Carlos
- Arias Sánchez, Oscar
- Aribau, Buenaventura Carles
- Arica
- aridisol
- Ariège
- Ariel
- Aries
- Arigböge
- Arikara
- aril
- Ariminum, Council of
- Arinnitti
- Arinos River
- Ariobarzanes
- Arion
- Ariosto, Ludovico
- Arisaema
- 'Arish, Al-
- Arishima Takeo
- Aristaeus
- Aristanemi
- Aristarchus OF SAMOS
- Aristarchus OF SAMOTHRACE
- Aristeas, Letter of
- Aristides
- Aristides QUINTILIANUS
- Aristides THE JUST
- Aristippus
- Aristobulus I
- Aristobulus II
- aristocracy
- Aristolochiales
- Aristomenes
- Ariston OF CHIOS
- Aristophanes OF BYZANTIUM
- Aristotelianism
- Aristoxenus
- arithmetic
- arithmetic function
- Arius
- ariya-puggala
- 'ariyah
- Arizona
- Arizona State University
- Arizona, University of
- Arjun
- Arjuna
- ark
- Ark of the Covenant
- ark shell
- Arkadelphia
- Arkalyk
- Arkansas
- Arkansas City
- Arkansas Post
- Arkansas River
- Arkansas River Navigation System
- Arkansas State University
- Arkansas, University of
- Arkatag
- Arkell, Anthony John
- Arkell, William Joscelyn
- Arkhangelsk
- Arklow
- Arkona
- arkose
- Arkwright, Sir Richard
- Arlberg
- Arlen, Harold
- Arlen, Michael
- Arles
- Arles, Council of
- Arletty
- Arlington
- Arlington Heights
- Arlington National Cemetery
- Arlington, Henry Bennet, 1st earl of
- Arliss, George
- Arlon
- Arlt, Roberto
- arm
- Armada
- armadillo
- armadillo lizard
- Armageddon
- Armagh
- Armagnac
- Armah, Ayi Kwei
- Armalite rifle
- armatole
- armature
- Armavir
- Armco Inc.
- Armenia
- Armenian
- Armenian alphabet
- Armenian Apostolic Church
- Armenian Catholic Church
- Armenian chant
- Armenian Highland
- Armenian language
- Armenian literature
- Armenian massacres
- Armenian rite
- Armentières
- Armfelt, Gustaf Mauritz
- Armidale
- Armillaria
- armillary sphere
- Armilus
- Arminianism
- Arminius
- Arminius, Jacobus
- armistice
- armlet
- armoire
- armorial ensign
- Armorica
- Armorican Massif
- Armory Show
- armour
- Armour, Philip Danforth
- armoured vehicle
- Armoury Museum
- arms control
- arms, coat of
- arms, roll of
- Armstrong
- Armstrong (of Cragside), William George Armstrong, Baron
- Armstrong, Edwin H.
- Armstrong, Henry
- Armstrong, Henry Edward
- Armstrong, John
- Armstrong, Louis (Daniel)
- Armstrong, Neil (Alden)
- Armstrong, Samuel Chapman
- army
- Arnaud, Georges
- Arnauld d'Andilly, Robert
- Arnauld FAMILY
- Arnauld, Antoine
- Arnauld, Jacqueline-Marie-Angélique
- Arnauld, Jeanne-Catherine-Agnès
- Arnaut DANIEL
- Arnaut DE MAREUIL
- Arndt, Ernst Moritz
- Arndt, Johann
- Arne, Thomas (Augustine)
- Arneth, Alfred, Ritter von
- Arnhem
- Arnhem Land
- Arnica
- Arniches (y Barrera), Carlos
- Arnim, Achim von
- Arnim, Bettina von
- Arnim, Hans Georg von
- Arnim, Harry (Karl Kurt Eduard), Graf von
- Arno River
- Arno, Peter
- Arnobius THE ELDER
- Arnold Arboretum of Harvard University
- Arnold OF BRESCIA
- Arnold, Benedict
- Arnold, Harold DeForest
- Arnold, Henry Harley
- Arnold, Matthew
- Arnold, Samuel
- Arnold, Sir Edwin
- Arnold, Thomas
- Arnoldson, Klas Pontus
- Arnolfo DI CAMBIO
- Arnsberg
- Arnstadt
- Arnulf
- Arnulf I
- Arnulf OF METZ, SAINT
- Arochukwu
- aromatic compound
- Aron, Raymond (-Claude-Ferdinand)
- Aroostook War
- Arosa
- Arp, Halton Christian
- Arp, Jean
- Arpad
- Árpád DYNASTY
- Arpino
- Arpino, Gerald
- Arrabal, Fernando
- Arrábida Highway Bridge
- arraignment
- Arraiolos rug
- Arran
- Arran, James Hamilton, 1st earl of
- Arran, James Hamilton, 2nd earl of, DUC (duke) DE CHÂTELHERAULT
- Arran, James Hamilton, 3rd earl of
- Arran, James Stewart, earl of
- arrangement
- Arras
- Arras lace
- arrastra
- Arrau, Claudio
- arrest
- Arrest, Heinrich Louis d'
- Arrhenius equation
- Arrhenius theory
- Arrhenius, Svante (August)
- Arriaga (y Balzola), Juan Crisóstomo (Jacobo Antonio)
- Arrian
- Arron, Henck (Alphonsus Eugène)
- Arrow Cross Party
- Arrow, Kenneth J(oseph)
- arrow-poison frog
- arrowhead
- arrowroot
- Arrowsmith, Aaron
- arrowworm
- arroyo
- Arrupe, Pedro
- Ars Antiqua
- Ars Nova
- Arsaces
- Arsacid DYNASTY
- arsenate mineral
- arsenic
- arsenic poisoning
- arsenide
- Arsenius Autorianus
- Arsenius THE GREAT
- arsenopyrite
- Arses
- arsine
- Arsinoe I
- Arsinoe II
- Arsinoe III
- Arsinoe IV
- Arsinoitherium
- arson
- Arsonval, Arsène d'
- arsphenamine
- Arsuf, Battle of
- art
- art brut
- art collection
- art conservation and restoration
- art criticism
- Art Deco
- art history
- Art Institute of Chicago
- Art Nouveau
- art, academy of
- Árta
- Árta, Gulf of
- Artabanus
- Artabanus I
- Artabanus III
- Artabanus V
- Artaud, Antonin
- Artavasdes II
- Artaxerxes I
- Artaxerxes II
- Artaxerxes III
- Artaxias
- Artemidorus
- Artemidorus Daldianus
- Artemis
- Artemis, Temple of
- Artemisa
- Artemisia I
- Artemisia II
- Artemisium, Battle of
- Artemivsk
- arteriosclerosis
- arteriovenous fistula
- arteritis
- artery
- Artesia
- artesian well
- Artevelde, Jacob van
- artha
- Artha-shastra
- arthapatti
- arthritis
- arthrodire
- arthropod
- Arthur
- Arthur I
- Arthur II
- Arthur Kill Bridge
- Arthur, Chester A(lan)
- Arthur, J.C.
- Arthur, Jean
- Arthur, Sir George, 1ST BARONET
- Arthurian legend
- arti
- Artibonite River
- artichoke
- articulation
- artificial heart
- artificial insemination
- artificial intelligence
- artificial organ
- artificial respiration
- artificial selection
- Artigas
- Artigas, José Gervasio
- artillery
- Artin, Emil
- artiodactyl
- Artis Zoological Garden
- Artois
- Arts and Crafts Movement
- Artsybashev, Mikhail Petrovich
- Artuqid DYNASTY
- Artvin
- Artyom
- Aru Islands
- Aruba
- Arum
- Arun
- Arunachal Pradesh
- Arundel
- Arundel, Henry Fitzalan, 12th earl of
- Arundel, Philip Howard, 1st (or 13th) earl of, EARL OF SURREY
- Arundel, Richard Fitzalan, 4th Earl of, 10TH EARL OF SURREY
- Arundel, Thomas
- Arundel, Thomas Fitzalan, 5th earl of, 11TH EARL OF SURREY
- Arundel, Thomas Howard, 2nd (or 14th) earl of, EARL OF SURREY, EARL OF NORFOLK
- Arundinaria
- Arung Singkang
- arupa-dhatu
- arupa-loka
- Aruqtai
- Arusha
- Arval Brothers
- Arve River
- Arverni
- Arwad, Jazirat
- Arya Samaj
- Aryabhata
- Aryabhata I
- Aryan
- aryballos
- Arzamas
- Arzamas society
- Arzawa
- Arzew
- as if, philosophy of
- Asaba
- asafetida
- Asahi shimbun
- Asahikawa
- Asaka
- Asalluhe
- Asam, Cosmas Damian; and Asam, Egid Quirin
- asana
- Asanga
- Asano Soichiro
- Asansol
- Asbest
- asbestos
- asbestosis
- Asbjørnsen, Peter Christen; and Moe, Jørgen Engebretsen
- Asbury Park
- Asbury, Francis
- Ascanian DYNASTIES
- Ascanius
- Ascari, Alberto
- ascariasis
- Ascaris
- Ascension
- asceticism
- Asch, Sholem
- Aschaffenburg
- Ascham, Roger
- aschelminth
- Aschersleben
- Aschoff, Karl Albert Ludwig
- ASCII
- ascites
- Asclepiadaceae
- Asclepiades OF BITHYNIA
- Asclepigenia
- Asclepius
- Ascoli Piceno
- Ascoli, Graziadio Isaia
- Ascomycetes
- Ascot
- ascus
- Aseb
- Asela
- Aselli, Gaspare
- Aseret Yeme Teshuva
- Asgard
- Ásgrímsson, Eysteinn
- ash
- Ash Wednesday
- Ash'ari, Abu al-Hasan al-
- Ashanti
- Ashanti empire
- 'Ashar min Ramadan, Madinat al-
- Ashbee, Charles Robert
- Ashbery, John (Lawrence)
- Ashbourne
- Ashburton
- Ashburton, John Dunning, 1st Baron
- Ashcan School
- Ashcroft, Dame Peggy
- Ashdod
- Ashe, Arthur (Robert)
- Asheboro
- Asher
- Asher ben Jehiel
- Asherah
- Ashes
- Asheville
- Ashfield
- Ashford
- Ashgabat
- Ashgill Series
- Ashi
- ashide-e
- Ashikaga
- Ashikaga Tadayoshi
- Ashikaga Takauji
- Ashikaga Yoshiaki
- Ashikaga Yoshimasa
- Ashikaga Yoshimitsu
- Ashiya
- Ashkenazi
- Ashkenazy, Vladimir
- Ashland
- Ashley, William Henry
- Ashmolean Museum of Art and Archaeology
- Ashmore and Cartier Islands
- Ashoka
- Ashqelon
- ashrama
- Ashrawi, Hanan
- Ashta Pradhan
- Ashtabula
- Ashton, Sir Frederick (William Mallandaine)
- Ashton-Warner, Sylvia (Constance)
- Ashur
- Ashur-uballit I
- 'Ashura`
- Ashurbanipal
- Ashurnasirpal I
- Ashurnasirpal II
- Ashvaghosa
- ashvamedha
- Ashwell, Lena
- Asia
- Asian Development Bank
- Asian Games
- Asiatic black bear
- Asiatic low
- Asiatic Society of Bengal
- asiento de negros
- Asik Pasa
- Asikpasazâde
- Asilah
- Asimov, Isaac
- Asinara Island
- Asino
- Asir
- Asirgarh
- asity
- 'Askari, Ja'far al-
- Askia DYNASTY
- Askja
- Askr and Embla
- Asma'i, al-
- Asmera
- Asmodeus
- Asnyk, Adam
- Aso, Mount
- asp
- Aspar, Flavius Ardaburius
- asparagine
- Asparagus
- asparagus beetle
- asparagus stone
- aspartic acid
- Aspasia
- aspen
- Aspendus
- Aspenström, (Karl) Werner
- aspergillosis
- Aspergillus
- asphalt
- asphalt tile
- asphaltite
- asphodel
- asphyxia
- aspic
- Aspidistra
- aspirate
- aspirin
- Aspiring, Mount
- Aspleniaceae
- Asplund, (Erik) Gunnar
- Asquith, H(erbert) H(enry), 1ST EARL OF OXFORD AND ASQUITH, VISCOUNT ASQUITH OF MORLEY
- asrava
- ass
- Assab
- Assad, Hafiz al-
- Assam
- Assamese language
- Assassin
- assassin bug
- Assateague Island
- Assault
- assault and battery
- assault rifle
- assaying
- Asselar man
- assemblage
- assemblé
- assembled gem
- Assemblies of God
- assembly
- assembly line
- Assen
- Asser
- Asser, Tobias Michael Carel
- assessment
- assessor
- assignat
- assigned counsel
- assimilation
- Assiniboia
- Assiniboin
- Assiniboine River
- Assis
- Assisi
- assistance, writ of
- assize
- Associated Press
- Associated Universities, Inc.
- association
- association croquet
- association football
- Association Internationale Africaine
- Association Internationale du Congo
- association test
- associative law
- associative learning
- assonance
- assortative mating
- assumpsit
- Assumption
- Assus
- Assyria
- Astaire, Fred
- astamangala
- Astarte
- astatine
- Astbury ware
- Astbury, John
- Astbury-Whieldon ware
- Astchap
- aster yellows
- Asterales
- asterism
- asteroid
- asthenia
- asthma
- Asti
- astigmatism
- astika
- Astilbe
- Astipálaia
- Astley, Philip
- astome
- Aston, Francis William
- Astor (of Hever Castle), Nancy Witcher Astor, Viscountess
- Astor (of Hever Castle), Waldorf Astor, 2nd Viscount, BARON ASTOR OF HEVER CASTLE
- Astor (of Hever, of Hever Castle), John Jacob Astor, 1st Baron
- Astor FAMILY
- Astor, John Jacob
- Astorga
- Astoria
- Astoria Canyon
- Astrakhan
- astringent
- astrobleme
- Astrodome
- astrogeology
- astrolabe
- astrology
- astronaut
- astronomical map
- astronomical observatory
- astronomical unit
- astronomy
- astrophysics
- Astruc OF LUNEL
- Asturias
- Asturias, Miguel Ángel
- Astyages
- Astyanax
- Asuka period
- Asunción
- Asunción, La
- asura
- Aswan
- Aswan High Dam
- asylum
- asymmetric synthesis
- Asyut
- Atacama
- Atacama Desert
- Atacama Plateau
- atacamite
- Atahuallpa
- Atakpamé
- Atalanta
- Atami
- Atar
- Atargatis
- 'Atasi, Hashim al-
- Ataturk Dam
- Ataulphus
- ataxia
- ataxite
- Atbara River
- 'Atbarah
- Atbasar
- Atchafalaya Bay
- Atchafalaya River
- Atchison
- Atchison, Topeka and Santa Fe Railway Company
- Ate
- atelectasis
- Aterian industry
- Ateste
- Atget, (Jean-)Eugène(-Auguste)
- Athabasca River
- Athabasca, Lake
- Athabaska, District of
- Athaliah
- Athamas
- Athanaric
- Athanasian Creed
- Athanasius I
- Athanasius THE ATHONITE, SAINT
- Athanasius, SAINT
- Atharvaveda
- atheism
- Athelney
- Athelstan
- Athena
- Athenaeus
- Athenagoras
- Athenagoras I
- Athenodorus CANANITES
- Athenry
- Athens
- atheriniform
- atherosclerosis
- Atherton
- Atherton Plateau
- Atherton, Gertrude Franklin
- athetosis
- Athis-Mons
- athletics
- Athlone
- Athlone, Godard van Reede, 1st earl of, BARON OF AGHRIM, HEER (Lord) VAN GINKEL
- Athol
- Atholl
- Atholl, John Murray, 2nd Earl and 1st Marquess of, EARL OF TULLIBARDINE, VISCOUNT OF BALQUHIDDER, LORD MURRAY, BALVANY, AND GASK
- Atholl, John Murray, 2nd Marquess and 1st Duke of, MARQUESS OF TULLIBARDINE, EARL OF STRATHTAY AND STRATHARDLE, VISCOUNT OF BALWHIDDER, GLENALMOND, AND GLENLYON, LORD MURRAY, BALVENIE, AND GASK
- Atholl, John Stewart, 4th Earl of
- Athos, Mount
- Atisha
- Atitlán, Lake
- Atkinson, Sir Harry
- Atl, Doctor
- Atlanta
- Atlanta Campaign
- Atlanta Compromise
- Atlanta Constitution
- Atlantic Charter
- Atlantic City
- Atlantic Coast Conference
- Atlantic Intracoastal Waterway
- Atlantic Ocean
- Atlantic Richfield Company
- Atlantic salmon
- Atlantic, Battle of the
- Atlantic, The
- Atlántico
- Atlantis
- atlas
- Atlas Mountains
- Atlas rocket
- Atlas, Charles
- Atli, Lay of
- Atlixco
- atman
- atmosphere
- atmospheric circulation
- atmospheric corona
- atmospheric pressure
- atmospheric refraction
- atmospheric science
- atmospheric turbulence
- atoll
- atom
- atomic bomb
- atomic clock
- Atomic Energy Commission
- atomic mass
- atomic number
- atomic physics
- atomic radius
- atomic time
- atomic weight
- atomism
- Aton
- atonality
- atonement
- Atoni
- atopic dermatitis
- atopy
- Atrato River
- atresia and stenosis
- Atreus
- Atreus, Treasury of
- Atri
- atrial fibrillation
- atrial septal defect
- Atriplex
- atrium
- atrophy
- atropine
- Atrypa
- Atsina
- Atsugi
- Atsuta
- attachment
- attack aircraft
- Attaignant, Pierre
- attainder
- Attalus I SOTER
- Attalus II PHILADELPHUS
- Attalus III PHILOMETOR EUERGETES
- Attalus, Priscus
- attar of roses
- 'Attar, Farid od-Din (Mohammad ebn Ebrahim)
- Attenborough, Sir David (Frederick)
- attention
- Atterbom, Per Daniel Amadeus
- Atterbury, Francis
- atthakatha
- attic
- Attica
- Atticus, Titus Pomponius
- Attikí
- Attila
- Attis
- attitude
- Attleboro
- Attlee, Clement (Richard), 1ST EARL ATTLEE OF WALTHAMSTOW, VISCOUNT PRESTWOOD
- attorney general
- attorney, power of
- Attucks, Crispus
- Attwood, Thomas
- Atum
- Atwater, Wilbur Olin
- Atwood, Margaret (Eleanor)
- Atyrau
- Atzcapotzalco
- Aubagne
- Aube
- Aube River
- Auber, Daniel-François-Esprit
- Aubignac, François Hédelin, abbé d'
- Aubigné, Théodore-Agrippa d'
- Aubrey, John
- Auburn
- Auburn system
- Auburn University
- Aubusson
- Aubusson carpet
- Aubusson, Pierre d'
- Aucassin et Nicolette
- Auch
- Auckland
- Auckland Islands
- Auckland, George Eden, Earl of, 2ND BARON AUCKLAND, 2ND BARON AUCKLAND OF AUCKLAND, BARON EDEN OF NORWOOD
- auction
- auction bridge
- Audaghost
- Aude
- Auden, W(ystan) H(ugh)
- Audiberti, Jacques
- audiencia
- audion
- audiovisual education
- audit
- auditorium
- Audley (of Walden), Thomas Audley, Baron
- Audubon, John James
- Auenbrugger von Auenbrugg, Leopold
- Auer, Leopold
- Auerbach, Berthold
- Auerbach, Erich
- Auerbach, Red
- Auersperg, Adolf (Karl Daniel), Prince (Fürst) von, DUKE (Herzog) VON GOTTSCHEE
- Aufbau principle
- Aufklärung
- Aufwuchs
- Augeas
- auger
- Auger effect
- auger mining
- Augereau, Pierre-François-Charles, DUKE (duc) DE CASTIGLIONE
- Augier, Émile
- augite
- Augmentations, Court of
- Augrabies Falls
- Augsburg
- Augsburg Confession
- Augsburg Interim
- Augsburg, Peace of
- augury
- August
- Augusta
- Augustan Age
- Augustan History
- Augustana College
- Augustana Evangelical Lutheran Church
- Augustine OF CANTERBURY, SAINT
- Augustinian
- Augustus
- Augustus II
- Augustus III
- auk
- auklet
- Aukrust, Olav
- Aulard, François-Alphonse
- Aulis
- Auliye-Ata
- Aulnoy, Marie-Catherine Le Jumel de Barneville, Countess (comtesse) d'
- aulos
- Aung San
- Aung San Suu Kyi
- Aunis
- Aurangabad
- Aurangzeb
- Auray
- Aurelia
- Aurelian
- Aurelian Wall
- aureole
- Aurès
- aureus
- Aurgelmir
- Auric, Georges
- aurichalcite
- auricle
- auricular style
- Aurignacian culture
- Aurillac
- Auriol, Vincent
- Aurobindo, Shri
- aurochs
- aurora
- aurresku
- Aurunci
- Auschwitz
- auscultation
- Auseklis
- Ausgleich
- Ausonius, Decimus Magnus
- Aust-Agder
- austausch coefficient
- Austen, Jane
- austenite
- Austerlitz, Battle of
- Austin
- Austin College
- Austin, Alfred
- Austin, Herbert Austin, Baron
- Austin, John
- Austin, John Langshaw
- Austin, Louis Winslow
- Austin, Mary
- Austin, Stephen
- Austral Islands
- Australia
- Australian Aboriginal languages
- Australian Aborigine
- Australian Alps
- Australian Antarctic Territory
- Australian Ballet
- Australian ballot
- Australian Capital Territory
- Australian Championships
- Australian Christmas tree
- Australian Colonies Government Act
- Australian Council of Trade Unions
- Australian Democratic Labor Party
- Australian Democrats
- Australian Encyclopaedia, The
- Australian External Territories
- Australian Labor Party
- Australian National University
- Australian Patriotic Association
- Australian region
- Australian rules football
- Australian terrier
- Australoid geographic race
- Australopithecus
- Austrasia
- Austria
- Austria-Hungary
- Austrian Hunting Carpet
- Austrian Netherlands
- Austrian school of economics
- Austrian Succession, War of the
- Austric languages
- Austro-Asiatic languages
- Austronesian languages
- Autant-Lara, Claude
- autecology
- auteur theory
- autism
- Autlán
- auto sacramental
- auto-da-fé
- autoantibody
- autocephalous church
- autoclave
- autogiro
- autograph
- Autoharp
- autohypnosis
- autoimmunity
- autokinetic effect
- Autolycus
- Automat
- automata theory
- automatic pilot
- automatic pistol
- automatic rifle
- automatic transmission
- automatic writing
- automation
- automatism
- automaton
- automobile
- automobile club
- automobile racing
- automorphism
- autonomic nervous system
- autopsy
- autostrada
- autotomy
- autumn
- Autun
- autunite
- Auvergne
- Auwers, (Georg Friedrich Julius) Arthur von
- Auxerre
- auxiliary
- auxin
- auxochrome
- Ava
- Avadana
- avadavat
- avahi
- avalanche
- avalanche effect
- Avalokiteshvara
- Avalon
- Avalon Peninsula
- Avalonian orogeny
- Avanti
- Avar
- Avar-Ando-Dido languages
- Avatamsaka-sutra
- avatar
- Avebury
- Avedon, Richard
- Aveiro
- Avellaneda
- Avellino
- Avempace
- Avenarius, Richard (Heinrich Ludwig)
- avens
- Aventinus
- aventurine
- 'avera
- average
- Averescu, Alexandru
- Averno, Lake of
- Averroës
- Aversa
- aversion therapy
- Avery, John
- Avery, Milton (Clark)
- Avery, Oswald (Theodore)
- Avery, Samuel Putnam
- Avesta
- Avestan language
- Aveyron
- Avezzano
- aviary
- aviation
- Avicenna
- aviculture
- Avidius Cassius, Gaius
- avidya
- Avignon
- Avignon papacy
- Avignon school
- avijja
- Ávila
- Ávila Camacho, Manuel
- Avilés
- Avinu Malkenu
- avionics
- Avison, Charles
- Avitus
- avocado
- avocet
- Avogadro's law
- avoidance behaviour
- avoidance relationship
- avoidance, zone of
- avoirdupois weight
- Avola
- Avon
- Avon, River
- Avranches
- avunculate
- Avvakum Petrovich
- AWACS
- Awaji Island
- 'Awali
- Awan
- Awangarda Krakowska
- Awash River
- awdl
- Awe, Loch
- Awka
- Awolowo, Obafemi
- Awoonor, Kofi
- ax
- Axelrod, Julius
- Axholme, Isle of
- axinite
- axiology
- axiom
- axiomatic method
- axis
- Axis Powers
- Axminster
- Axminster carpet
- axolotl
- axon
- Ay
- Ayacucho
- Ayacucho, Battle of
- Ayala, Francisco
- Aybak
- Aydin
- Aydin DYNASTY
- aye-aye
- Ayer, Sir A.J.
- Ayers Rock
- Aylesbury
- Aylesbury Vale
- Ayllón, Lucas Vázquez de
- Aylmer, John
- Aymara
- Aymaran languages
- Aymé, Marcel
- 'ayn
- 'Ayn Jalut, Battle of
- 'Ayn, al-
- Ayodhya
- Ayr
- ayre
- Ayrer, Jakob
- Ayres, Anne
- Ayrshire
- Ayrshire whitework
- Aytmatov, Chingiz
- Ayton, Sir Robert
- Aytoun, William Edmondstoune
- Ayub Khan, Mohammad
- Ayutthaya
- 'ayyar
- Ayyubid DYNASTY
- Azad Kashmir
- Azaïs, Pierre-Hyacinthe
- azalea
- Azali
- Azamgarh
- Azande
- Azare
- Azariah, The Prayer of
- azathioprine
- Azay-le-Rideau
- Azazel
- Azaña y Díaz, Manuel
- Azeglio, Massimo Taparelli, marchese d'
- azeotrope
- Azerbaijan
- Azerbaijani
- Azevedo, Aluízio
- Azhar University, Al-
- Azhari, Isma'il al-
- azide
- Azikiwe, Nnamdi
- Azilian industry
- 'Aziz, al-
- azlon
- azo compound
- azo dye
- Azogues
- Azores
- Azorín
- Azov
- Azov Upland
- Azov, Sea of
- Aztec
- Aztec calendar
- Aztec Ruins National Monument
- Azteco-Tanoan languages
- Azua
- Azuchi-Momoyama period
- Azuela, Mariano
- Azuero Peninsula
- azulejo
- azurite
- Azzone DEI PORCI
- B'nai B'rith
- B-1
- B-17
- B-24
- B-29
- B-52
- B.A.T Industries PLC
- B.E.M.
- ba
- Ba Jin
- Ba Maw
- ba'al shem
- Ba'al Shem Tov
- Ba'qubah
- Ba'th Party
- Baader, Franz Xaver von
- Baal
- Baalat
- Baalbek
- Baarle-Hertog
- Bab, the
- Baba Taher
- Baba-Yaga
- Babahoyo
- Babalola, S(olomon) Adeboye
- Babar Island
- babassu palm
- Babbage, Charles
- babbitt metal
- Babbitt, Irving
- Babbitt, Isaac
- Babbitt, Milton
- babbler
- Babcock, Harold Delos
- Babcock, Horace Welcome
- Babcock, Stephen Moulton
- Babel, Isaak Emmanuilovich
- Babel, Tower of
- Babelthuap
- Babenberg, HOUSE OF
- Babergh
- babesiosis
- Babeuf, François-Noël
- Babia, Mount
- Babington, Anthony
- babirusa
- Babism
- Babits, Mihály
- Babol
- baboon
- Babrius
- Babur
- Baburen, Dirck van
- Babuyan Islands
- Baby Yar
- baby's breath
- Babylon
- Babylonia
- Babylonian calendar
- Babylonian Exile
- Babylonian Talmud
- Bac Lieu
- Bac Thai
- Bacab
- Bacan
- Bacau
- Baccarat
- Baccarat glass
- Bacchanalia
- Bacchelli, Riccardo
- Bacchus Marsh
- Bacchylides
- Baccio D'AGNOLO
- Bach Long Vi
- Bach, Carl Philipp Emanuel
- Bach, Johann Christian
- Bach, Johann Christoph Friedrich
- Bach, Wilhelm Friedemann
- Bacheller, Irving (Addison)
- Bachman, John
- Bachofen, Johann Jakob
- Baciccia
- Bacillariophyta
- bacillite
- bacillus
- back swimmer
- Back, Sir George
- Backbone Mountain
- backcross
- backgammon
- Backhaus, Wilhelm
- backpacking
- Bacolod
- bacon
- Bacon, Francis
- Bacon, Francis Thomas
- Bacon, Henry
- Bacon, John
- Bacon, Nathaniel
- Bacon, Roger
- Bacon, Sir Nicholas
- Baconian method
- Baconthorpe, John
- Bács-Kiskun
- bacteremia
- bacteriology
- bacteriophage
- bacterium
- Bactria
- Bactrites
- Baculites
- baculum
- Bad Aussee
- Bad Dürkheim
- Bad Gandersheim
- Bad Godesberg
- Bad Harzburg
- Bad Homburg
- Bad Ischl
- Bad Kreuznach
- Bad Mergentheim
- Bad Reichenhall
- Bada`uni, 'Abd al-Qadir
- Badaga
- Badagara
- Badagry
- Badajoz
- Badakhshan
- Badalona
- Badami
- Badarian culture
- Baddeck
- Baden
- Baden-Baden
- Baden-Powell (of Gilwell), Robert Stephenson Smyth Baden-Powell, 1st Baron
- Baden-Württemberg
- Badeni, Kasimir Felix, Graf von
- Badenoch and Strathspey
- Badgastein
- badger
- Badin
- Badings, Henk
- badland
- Badlands National Park
- badminton
- Badoglio, Pietro
- Badr Khani Jaladat
- Badr, Battle of
- Badrinath
- Badulla
- Baeck, Leo
- Baedeker, Karl
- Baekeland, Leo Hendrik
- Baer, Karl Ernst, Ritter von (knight of), EDLER (lord) VON HUTHORN
- Baer, Max
- baetylus
- Baeyer, Adolf von
- Báez, Buenaventura
- Baez, Joan
- Bafatá
- Baffin
- Baffin Bay
- Baffin Island
- Baffin Island Current
- Baffin, William
- Bafing River
- Bafoussam
- Baga
- Bagamoyo
- bagasse
- bagatelle
- Bagé
- Bagehot, Walter
- Baggesen, Jens (Immanuel)
- Baghdad
- Baghdad Railway
- Baghdad school
- Baghelkhand
- Bagherhat
- Bagheria
- Baghlan
- Baghmati River
- Bagirmi
- Bagirmi, Kingdom of
- Bagley, William Chandler
- Baglioni FAMILY
- Bagnold, Enid
- Bagnold, Ralph A(lger)
- Bago
- Bagoas
- bagpipe
- Bagratid
- Bagration, Pyotr Ivanovich, Knyaz
- Bagritsky, Eduard Georgiyevich
- Baguio
- bagworm moth
- Bagyidaw
- Baha` ad-Din Zuhayr
- Baha` Ullah
- Baha`i faith
- Baha`i temple
- Bahadur Shah I
- Bahadur Shah II
- Bahadurpur, Battle of
- Bahah, al-
- Bahamas, The
- Bahar, Muhammad Taqi
- Baharampur
- Bahawalnagar
- Bahawalpur
- Bahia
- Bahía Blanca
- Bahmani SULTANATE
- Bahnaric languages
- Bahr al-'Arab
- Bahr al-Ahmar, al-
- Bahr al-Ghazal
- Bahr al-Jabal
- Bahr az-Zaraf
- Bähr, George
- Bahr, Hermann
- Bahraich
- Bahrain
- Bahram
- Bahram I
- Bahram II
- Bahram IV
- Bahram V
- Bahram VI Chubin
- Bahrdt, Carl Friedrich
- Bahubali
- Bahuti, al-
- Bahya ben Joseph ibn Pakuda
- Baia Mare
- Baiae
- Baie-Comeau
- Baïf, Jean-Antoine de
- Baikal, Lake
- Baikalsky Nature Reserve
- Baikie, William Balfour
- Baikonur
- bail
- Bailey, Gamaliel
- Bailey, Hannah Clark Johnston
- Bailey, James A(nthony)
- Bailey, Liberty Hyde
- Bailey, Pearl (Mae)
- Bailey, Sir Donald Coleman
- bailiff
- Baillie, Joanna
- Baillie, Lady Grizel
- Baillie, Matthew
- Baillie, Robert
- Baillou, Guillaume de
- Bailly, Jean-Sylvain
- bailment
- Baily's beads
- Baily, Francis
- Bain, Alexander
- Bainbridge
- Bainbridge, John
- Bainbridge, William
- Baines, Thomas
- Bainville, Jacques
- Baird, Bil and Cora
- Baird, John Logie
- Baird, Spencer Fullerton
- Baire, René-Louis
- Bairnsdale
- Bairnsfather, (Charles) Bruce
- Bais
- Baius, Michael
- Baja
- Baja California
- Baja California Sur
- bajada
- Bajah
- Bajer, Fredrik
- Bajío
- Bajor, Gizi
- Bakelite
- Bakema, Jacob B(erend)
- Baker Island
- Baker v. Carr
- Baker, Augustine
- Baker, Carlos (Heard)
- Baker, Dame Janet
- Baker, George Fisher
- Baker, George Pierce
- Baker, James Addison, III
- Baker, Josephine
- Baker, LaFayette Curry
- Baker, Newton D(iehl)
- Baker, Ray Stannard
- Baker, Sara Josephine
- Baker, Sir Benjamin
- Baker, Sir Richard
- Baker, Sir Samuel White
- Baker, Theodore
- Bakersfield
- Bakewell glass
- Bakewell, Robert
- Bakhchysaray
- Bakht Khan
- Bakhtaran
- Bakhtiar, Shahpur
- Bakhtiari rug
- Bakhtyari
- Bakhuis Gebergte
- Bâkî
- baking
- baking powder
- baklava
- Bakony Mountains
- Bakoye River
- Bakr, Ahmad Hassan al-
- Baksar, Battle of
- Bakst, Léon
- Baku
- Baku rug
- Bakunin, Mikhail Aleksandrovich
- Bala
- Balaam
- Balabac
- Baladhuri, al-
- Balaghat
- Balaghat Range
- Balaguer (i Cirera), Victor
- Balaguer (y Ricardo), Joaquín (Vidella)
- Balakirev, Mily (Alekseyevich)
- Balaklava, Battle of
- Balakovo
- balalaika
- balance
- balance beam
- Balanchine, George
- Balanopales
- Balanophoraceae
- Balantidium
- Balao
- Balarama
- Balard, Antoine-Jérôme
- balas ruby
- Balash
- Balashikha
- Balasore
- Balassi, Bálint
- balata
- Balaton, Lake
- Balatonfüred
- Balbinus, Decimus Caelius Calvinus
- Balbo, Cesare, Count
- Balbo, Italo
- Balboa
- Balboa, Vasco Núñez de
- Balbuena, Bernardo de
- Balbus, Lucius Cornelius
- Balch, Emily Greene
- Balchin, Nigel (Marlin)
- Balcon, Sir Michael
- balcony
- bald cypress
- bald eagle
- baldachin
- Balder
- Baldinucci, Filippo
- baldness
- Baldovinetti, Alesso
- baldpate
- Baldung-Grien, Hans
- Baldwin I
- Baldwin II
- Baldwin II PORPHYROGENITUS
- Baldwin III
- Baldwin IV
- Baldwin V
- Baldwin, Frank Stephen
- Baldwin, Henry
- Baldwin, James (Arthur)
- Baldwin, James Mark
- Baldwin, Matthias William
- Baldwin, Robert
- Baldwin, Roger Nash
- Baldwin, Stanley, 1ST EARL BALDWIN OF BEWDLEY, VISCOUNT CORVEDALE OF CORVEDALE
- Baldy Mountain
- Bale, John
- Balearic Islands
- baleen whale
- Balenciaga, Cristóbal
- baler
- Bales, Peter
- Balewa, Sir Abubakar Tafawa
- Balfe, Michael William
- Balfour (of Pittendreich), Sir James
- Balfour (of Whittingehame), Arthur James Balfour, 1st earl of, VISCOUNT TRAPRAIN
- Balfour Declaration
- Balfour, Francis Maitland
- Balfour, Robert
- Bali
- Balikesir
- Balikpapan
- Balinese
- Balkan Entente
- Balkan League
- Balkan Mountains
- Balkan Wars
- Balkans
- Balkh
- Balkhash
- Balkhash, Lake
- balkline billiards
- ball
- ball bearing
- ball cactus
- ball lightning
- Ball State University
- Ball, Albert
- Ball, Hugo
- Ball, John
- Ball, Lucille
- Ball, Sir Alexander John, 1ST BARONET
- Ball, Thomas
- ball-and-socket joint
- Balla, Giacomo
- ballad
- ballad opera
- ballad revival
- ballade
- Balladur, Édouard
- Ballance, John
- Ballanche, Pierre-Simon
- Ballarat
- Ballard FAMILY
- ballet
- Ballet comique de la reine
- ballet d'action
- ballet movement
- ballet position
- Ballet Rambert
- Ballet Russe de Monte Carlo
- Ballets Russes
- balletto
- Ballia
- Ballina
- Ballinasloe
- Ballinger, Richard A(chilles)
- Balliol FAMILY
- ballista
- ballistic pendulum
- ballistics
- ballistocardiography
- ballistospore
- Ballivián, Lake
- balloon
- balloon fly
- balloon framing
- balloon vine
- balloonflower
- ballooning
- Ballou, Hosea
- ballroom dance
- Bally
- Ballycastle
- Ballymena
- Ballymoney
- balm
- Balmaceda, José Manuel
- Balmain, Pierre (-Alexandre-Claudius)
- Balmer, Johann Jakob
- Balmes, Jaime Luciano
- Balmoral Castle
- Balnaves, Henry
- Balochi
- Balochi language
- Balochi rug
- Balochistan
- Balodis, Janis
- Balon, Jean
- Balquhidder
- Balranald
- balsa
- balsam
- Balsamon, Theodore
- Balsas River
- Balt
- Balthus
- Balti
- Baltic Entente
- Baltic languages
- Baltic religion
- Baltic Sea
- Baltic states
- Baltimore
- Baltimore (of Baltimore), Cecilius Calvert, 2nd Baron
- Baltimore (of Baltimore), Charles Calvert, 3rd Baron
- Baltimore (of Baltimore), George Calvert, 1st Baron
- Baltimore and Ohio Railroad
- Baltimore clipper
- Baltimore, David
- Baltistan
- Baltiysk
- Balto-Slavic languages
- Baltra Island
- baluchitherium
- Balue, Jean
- Balurghat
- balustrade
- Baluze, Étienne
- Balzac, Honoré de
- Balzac, Jean-Louis Guez de
- Bamako
- Bambara
- Bambara states
- Bamberg
- Bamberger, Ludwig
- Bambocciati
- bamboo
- Bamboo Annals
- bamboo rat
- Bamburgh
- Bamenda
- Bamford, Samuel
- Bamian
- Bamileke
- Bampton, John
- Bamum
- ban
- Bana
- Banaba
- Banach, Stefan
- banana
- Bananal Island
- bananaquit
- Banaras, Treaties of
- Banas River
- Banat
- Banbridge
- Banbury
- Banchieri, Adriano
- Banco National Park
- Bancroft
- Bancroft, Edward
- Bancroft, George
- Bancroft, Hubert Howe
- Bancroft, Sir Squire
- band
- band theory
- band-pass filter
- Banda
- Banda Aceh
- Banda Islands
- Banda Sea
- Banda Singh Bahadur
- Banda, Hastings Kamuzu
- Bandama River
- Bandar Seri Begawan
- Bandar-e 'Abbas
- Bandar-e Bushehr
- Bandaranaike, S(olomon) W(est) R(idgeway) D(ias)
- Bandaranaike, Sirimavo Ratwatte Dias
- banded-iron formation
- bandeira
- Bandeira (Filho), Manuel (Carneiro de Sousa)
- Bandelier National Monument
- Bandelier, Adolph
- Bandello, Matteo
- bandhani work
- bandicoot
- bandicoot rat
- Bandiera, Attilio; and Bandiera, Emilio
- Bandinelli, Baccio
- Bandirma
- Bandon
- Bandon, River
- Bandula, Maha
- Bandundu
- Bandung
- Bandung Conference
- bandurria
- bandwidth
- bandy
- bandy-bandy
- baneberry
- Banér, Johan
- Banerjea, Sir Surendranath
- Banff
- Banff and Buchan
- Banff National Park
- Banffshire
- Bang, Bernhard Lauritz Frederik
- Bang, Herman
- Bangalore
- Banggai Islands
- Banghazi
- Bangka
- Bangkok
- Bangladesh
- Bangor
- Bangui
- Bangweulu
- Banha
- Baní
- Bani River
- Bani Suwayf
- Bania
- Banihal Pass
- Banim, John and Michael
- Banister, John
- Banja Luka
- Banjarmasin
- banjo
- banjo clock
- Banjul
- bank
- Bank Craps
- bank holiday
- Bank of Boston Corporation
- Bank of China Building
- Bank of New York Company, Inc., The
- Bank Street College of Education
- Bank War
- BankAmerica Corporation
- Bankers Trust New York Corporation
- bankruptcy
- Banks Island
- Banks Islands
- Banks Peninsula
- Banks, Nathaniel P.
- Banks, Sir Joseph, BARONET
- Bankura
- Bann, River
- Bannatyne, George
- Banneker, Benjamin
- Banner system
- banneret
- banning
- Bannister, Sir Roger (Gilbert)
- bannock
- Bannockburn
- Bannockburn, Battle of
- Bannu
- Bansang
- banshee
- Banská Bystrica
- Banswara
- Bantam
- banteng
- Banting, Sir Frederick Grant
- Bantock, Sir Granville
- Bantry Bay
- Bantu languages
- Bantu peoples
- Banville, (Étienne-Claude-Jean-Bap-tiste-) Théodore (-Faullain) de
- Banyak Islands
- banyan
- Banyuwangi
- Banzart
- Bánzer Suárez, Hugo
- Bao Dai
- baobab
- Baol
- Baptism
- Baptist
- Baptist Federation of Canada
- Baptist General Conference
- Baptist Missionary Association of America
- Baptist Union of Great Britain and Ireland
- Baptist World Alliance
- Baptiste
- baptistery
- Baqdash, Khalid
- Baqqarah
- Bar
- bar association
- Bar form
- Bar Harbor
- Bar Hebraeus
- Bar Kokhba
- Bar Mitzvah
- bar Sauma, Rabban
- Bar, Confederation of
- Bar, François de
- Bar-le-Duc
- Bar-Salibi, Jacob
- Bara
- Bara Banki
- Bara, Theda
- Barabbas
- Baraboo
- Baracaldo
- Baracoa
- Barada
- Baragwanathia
- Barahona
- Barahona de Soto, Luis
- Baraita
- Baraka, Imamu Amiri
- Barakzay DYNASTY
- Baram River
- Baramula
- Baranagar
- Baranauskas, Antanas
- barangay
- Barani, Ziya`-ud-Din
- Baranovichi
- Barante, Amable-Guillaume-Prosper Brugière, baron de
- Bárány, Robert
- Baranya
- Barari Ghat, Battle of
- Barasat
- barasingha
- Barat, Saint Madeleine-Sophie
- Barataria Bay
- Baratieri, Oreste
- Baratynsky, Yevgeny Abramovich
- barb
- Barbacena
- Barbados
- Barbados cherry
- Barbados Ridge
- Barbara, SAINT
- Barbari, Jacopo de'
- Barbarossa
- Barbary
- Barbary ape
- Barbary pirate
- barbastelle
- Barbauld, Anna Laetitia
- Barbé-Marbois, François, marquis de
- barbecue
- barbed wire
- Barbeitos, Arlindo (do Carmo Pires)
- barber
- Barber, Red
- Barber, Samuel
- Barberi, Domenico, BLESSED
- Barberini FAMILY
- barberry
- barbershop quartet singing
- Barberton
- barbet
- Barbey d'Aurevilly, Jules-Amédée
- Barbeya
- Barbie, Klaus
- Barbier, Antoine-Alexandre
- Barbirolli, Sir John
- barbiturate
- barbituric acid
- Barbizon school
- Barbon, Nicholas
- Barbon, Praise-God
- Barbooth
- Barbosa, Jorge (Vera-Cruz)
- Barbotine ware
- Barbour, John
- Barbour, Philip P(endleton)
- Barbourville
- Barbusse, Henri
- barcarole
- Barcelona
- Barcelona chair
- Barcelona, Archaeological Museum of
- barchan
- Barclay de Tolly, Mikhail Bogdanovich, Knyaz
- Barclay, Alexander
- Barclay, John
- Barclay, Robert
- Barclays Bank PLC
- bard
- Bardeen, John
- Bardesanes
- Bardi FAMILY
- Bardi, Giovanni, CONTE (count) DI VERNIO
- Bardo, Treaty of
- Bardot, Brigitte
- Bardsey Island
- Bardstown
- bareback bronc-riding
- Barebones Parliament
- Bareilly
- Barenboim, Daniel
- Barents Sea
- Barents, Willem
- Barère (de Vieuzac), Bertrand
- bargeboard
- Bargello Museum
- bargello work
- Barghash (ibn Sa'id)
- Barghawatah
- Barghest
- Barguzinsky Nature Reserve
- Bari
- Bari, Siege of
- Barid Shahi DYNASTY
- Barinas
- Barind
- Baring FAMILY
- Baring, Maurice
- Baringo, Lake
- Baripada
- Barisal
- barite
- baritone
- barium
- bark
- bark beetle
- bark painting
- bark-gnawing beetle
- barkentine
- Barker, George
- Barker, Lady Mary Anne
- Barker, Ma
- Barkerville
- Barkhausen effect
- Barkhausen, Heinrich Georg
- Barking and Dagenham
- Barkla, Charles Glover
- Barkley, Alben W(illiam)
- Barkly Tableland
- Barkly, Sir Henry
- Barlach, Ernst
- Barletta
- barley
- Barlow, Joel
- Barlow, Peter
- Barmakids
- Barmen, Synod of
- Barmer
- barn
- barn owl
- Barnabas, Letter of
- Barnabas, SAINT
- Barnack, Oskar
- barnacle
- barnacle goose
- Barnard Castle
- Barnard's star
- Barnard, Chester Irving
- Barnard, Christiaan (Neethling)
- Barnard, Edward Emerson
- Barnard, Frederick (Augustus Porter)
- Barnard, George Grey
- Barnard, Henry
- Barnard, Kate
- Barnard, Lady Anne
- Barnardo, Thomas John
- Barnato, Barney
- Barnaul
- Barnave, Antoine (-Pierre-Joseph-Marie)
- Barnes, Albert C(oombs)
- Barnes, Barnabe
- Barnes, Ernest William
- Barnes, George Nicoll
- Barnes, Robert
- Barnes, Thomas
- Barnes, William
- Barnet
- Barnet, Battle of
- Barnet, Charlie
- Barnett, Samuel A(ugustus)
- Barnsley
- Barnstable
- Barnstaple
- Barnum, P(hineas) T(aylor)
- barnyard grass
- Baro
- Barocci, Federico
- Baroja (y Nessi), Pío
- barometer
- barometric light
- baron
- Baron, Michel
- Baron, Salo Wittmayer
- Barone, Enrico
- baronet
- Baronius, Caesar
- Barons' War
- baroque pearl
- Baroque period
- Barossa Valley
- barotrauma
- Barquisimeto
- Barra
- Barra do Piraí
- Barra Mansa
- Barracco Museum of Antique Sculpture
- Barrackpore
- Barrackpore Mutiny
- barracuda
- barracudina
- Barrancabermeja
- Barranco
- Barrande, Joachim
- Barranquilla
- Barras, Paul-François-Jean-Nicolas, vicomte de
- Barrault, Jean-Louis
- barre
- barrel
- barrel cactus
- barrel organ
- barrel piano
- barrel vault
- Barrell, Joseph
- Barremian Stage
- Barren Grounds
- Barrès, (Auguste-)Maurice
- Barreto, Francisco
- Barretos
- Barrett, Kate Harwood Waller
- Barrett, Lawrence
- Barrie
- Barrie, Sir James (Matthew), BARONET
- barrier reef
- Barrington
- Barrington, George
- Barrio Obrero Industrial
- Barrios, Eduardo
- Barrios, Justo Rufino
- barrister
- Barrois
- Barron River
- Barron, Clarence W(alker)
- Barros Arana, Diego
- Barros, João de
- Barrot, Odilon
- barrow
- Barrow Island
- Barrow, Clyde; and Parker, Bonnie
- Barrow, Henry
- Barrow, Isaac
- Barrow, River
- Barrow-in-Furness
- Barry
- Barry, (Marie-) Jeanne Bécu, comtesse du
- Barry, James
- Barry, John
- Barry, Philip
- Barry, Sir Charles
- Barrymore, Ethel
- Barrymore, Georgiana
- Barrymore, John
- Barrymore, Lionel
- Barrymore, Maurice
- Barsisa
- Barstow
- Barstow, Stan
- Bart, Jean
- Bartas, Guillaume de Salluste, seigneur du
- Bartenstein, Johann Christoph, Freiherr von
- barter
- Barth, Heinrich
- Barth, John (Simmons, Jr.)
- Barth, Karl
- Barth, Paul
- Barthélemy, Jean-Jacques
- Barthélemy-Saint-Hilaire, Jules
- Barthelme, Donald
- Barthes, Roland (Gérard)
- Bartholdi, Frédéric-Auguste
- Bartholin, Caspar Berthelsen
- Bartholin, Erasmus
- Bartholin, Thomas
- Bartholomaeus ANGLICUS
- Bartholomé, Albert
- Bartholomew I
- Bartholomew, Freddie
- Bartholomew, John George
- Bartholomew, SAINT
- Barthou, (Jean-) Louis
- Bartica
- Bartle Frere, Mount
- Bartlesville
- Bartlett, John
- Bartlett, John Russell
- Bartlett, Sir Frederic C(harles)
- Bartmannkrug
- Bartók, Béla
- Bartold, Vasily V(ladimirovich)
- Bartoli, Daniello
- Bartoli, Matteo Giulio
- Bartolomeo, Fra
- Bartolozzi, Francesco
- Bartolus OF SAXOFERRATO
- Barton, Clara
- Barton, Derek H.R.
- Barton, Elizabeth
- Barton, Sir Edmund
- bartonellosis
- Bartonian Stage
- Bartow
- Bartram, John
- Baruch, Apocalypse of
- Baruch, Bernard
- Baruch, Book of
- Bærum
- Baruni
- Baruta
- Barwani
- Bary, Heinrich Anton de
- Barye, Antoine-Louis
- Barylambda
- baryon
- Baryshnikov, Mikhail (Nikolayevich)
- baryton
- Barzani, Mustafa al-
- Barzaz Breiz
- Barzizza, Gasparino da
- Barzun, Jacques
- bas-relief
- Bas-Rhin
- basal metabolic rate (BMR)
- basalt
- basaltes ware
- Basanavicius, Jonas
- basanite
- Basasiri, Arslan al-Muzaffar al-
- Basava
- Basavan
- Bascom, Florence
- Bascom, William R.
- base
- baseball
- Baseball Hall of Fame
- Basedow, Johann Bernhard
- Basel
- Basel Zoological Garden
- Basel, Confession of
- Basel, Council of
- Basel-Landschaft
- Basel-Stadt
- baselevel
- Basellaceae
- basenji
- BASF Aktiengesellschaft
- Bashan
- bashi-bazouk
- Bashir Shihab II
- Bashkir
- Bashkortostan
- Basho
- Basic English
- basic oxygen process
- basidiocarp
- Basidiomycetes
- Basie, Count
- basil
- Basil I
- Basil II
- Basil OF ANCYRA
- Basil THE CHAMBERLAIN
- Basil THE GREAT, SAINT
- Basil, Colonel W. de
- Basil, Liturgy of Saint
- Basilan
- Basildon
- Basile, Giambattista
- Basilian
- Basilica
- Basilicata
- Basilides
- Basilios
- Basiliscus
- basilisk
- Basilosaurus
- Basin and Range Province
- Basin, Thomas
- Basingstoke and Deane
- Basirhat
- Baskerville, John
- basket-flower
- basket-of-gold
- basketball
- basketry
- Baskin, Leonard
- basking shark
- Basmachi Revolt
- basmalah
- Basohli painting
- Basov, Nikolay Gennadiyevich
- Basque
- Basque Country
- Basque language
- Basra
- bass
- bass drum
- Bass Strait
- Bass, George
- Bass, Sam
- Bass, Saul
- Bassani, Giorgio
- Bassano del Grappa
- Bassano, Jacopo
- Bassar
- basse danse
- Basse Santa Su
- Basse-Normandie
- basse-taille
- Basse-Terre
- Bassein
- Bassein, Treaty of
- Bassermann, Albert
- Bassermann, Ernst
- basset horn
- basset hound
- Basseterre
- Bassetlaw
- Bassett, John Spencer
- Bassi, Agostino
- Bassi, Ugo
- Bassompierre, François de
- bassoon
- Bassville, Nicolas-Jean Hugou de
- basswood
- bast fibre
- Bastam
- bastard toadflax
- Bastarnae
- Baster
- Bastet
- Basti
- Bastia
- Bastian, Adolf
- Bastiat, Frédéric
- bastide
- Bastien-Lepage, Jules
- Bastille
- bastnaesite
- Bastrop
- Bastwick, John
- bat
- bat bug
- bat fly
- Bat Yam
- bat-eared fox
- Bataan Death March
- Bataan Peninsula
- Batabanó, Gulf of
- Bataille, (Félix-)Henry
- Bataille, Georges
- Batak
- Batak Protestant Christian Church
- Batala
- Batalha
- Batan Islands
- Batangas
- Batavi
- Batavia
- Batavian Republic
- Bataysk
- Batdâmbâng
- Bate, W(alter) Jackson
- bateleur
- Bateman, H(enry) M(ayo)
- Bateman, H(ezekiah) L(inthicum)
- Bateman, Hester
- Batemans Bay
- Bates, Edward
- Bates, H(enry) W(alter)
- Bates, H(erbert) E(rnest)
- Bates, Katharine Lee
- Bates, Marston
- Bates, Sir Percy Elly, 4TH BARONET
- Batesian mimicry
- Bateson, William
- Batesville
- batfish
- bath
- bath chair
- Bath, Henry Frederick Thynne, 6th MARQUESS OF
- Bath, The Most Honourable Order of the
- Bath, Thomas Thynne, 1st Marquess of, VISCOUNT WEYMOUTH, BARON THYNNE OF WARMISTER
- Bath, William Pulteney, 1st Earl of, VISCOUNT PULTENEY OF WRINGTON, BARON OF HEDON
- batholith
- Bathonian Stage
- Báthory, Sigismund
- bathos
- Bathsheba
- Bathurst
- Bathurst (of Bathurst), Allen Bathurst, 1st Earl, BARON BATHURST OF BATTLESDEN
- Bathurst (of Bathurst), Henry Bathurst, 2nd Earl, BARON BATHURST OF BATTLESDEN, LORD APSLEY, BARON OF APSLEY
- Bathurst (of Bathurst), Henry Bathurst, 3rd Earl, BARON BATHURST OF BATTLESDEN, LORD APSLEY, BARON OF APSLEY
- Bathurst Island
- bathyal zone
- Bathycles
- bathymetry
- bathyscaphe
- bathysphere
- bathythermograph
- Bathyuriscus
- batik
- Batinah, Al-
- Batiniyah
- Batista (y Zaldívar), Fulgencio
- Batlle Berres, Luis
- Batlle y Ordóñez, José
- Batman
- Batna
- Batoche
- Baton Rouge
- Batoni, Pompeo Girolamo
- Batrachospermum
- Batsányi, János
- battalion
- Battani, al-
- battement
- Batten, Jean
- Battenberg FAMILY
- batter
- battering ram
- Battersea
- Battersea enamelware
- battery
- Batthyány, Lajos, Count
- Batticaloa
- Battishill, Jonathan
- Battle
- Battle Creek
- Battle of Brunanburh, The
- Battle of Maldon, The
- battledore and shuttlecock
- Battleford
- battlement
- battleship
- Batu
- Batu Islands
- Batu Pahat
- Batumi
- Baty, Gaston
- Batyushkov, Konstantin Nikolayevich
- Batz, Jean, Baron de
- Bau
- Bauchi
- Baudelaire, Charles (-Pierre)
- Baudissin, Wolf Heinrich, Count (Graf) von
- Baudot, Jean-Maurice-Émile
- Baudouin de Courtenay, Jan Niecislaw
- Baudouin I
- Bauer, Gustav (Adolf)
- Bauer, Harold
- Bauer, Otto
- Bauer, Sebastian Wilhelm Valentin
- Bauernfeld, Eduard von
- Baugh, Sammy
- Bauhaus
- Bauhin, Gaspard
- Baul
- Baule
- Baum, L(yman) Frank
- Baum, Vicki
- Baumann Peak
- Baumbach, Rudolf
- Baumes Laws
- Baumgarten, Alexander Gottlieb
- Baunsgaard, Hilmar (Tormod Ingolf)
- Baur, Ferdinand Christian
- Bauria
- Bauru
- Bauta
- Bautzen
- bauxite
- Bavand DYNASTY
- Bavaria
- Bavarian Alps
- Bavarian cream
- Bavarian Forest
- Bavarian State Picture Galleries
- Bavarian Succession, War of the
- bawu
- Bax, Sir Arnold (Edward Trevor)
- Baxter, Andrew
- Baxter, George
- Baxter, James K(eir)
- Baxter, Richard
- bay
- Bay Bridge
- Bay City
- Bay Islands
- bay leaf
- Bay of Pigs invasion
- Bay of Plenty
- bay owl
- Bay Psalm Book
- Bay Saint Louis
- bay tree
- bay window
- Bay, Laguna de
- Baya
- Bayamo
- Bayamón
- Bayan
- Bayar, (Mahmud) Celâl
- Bayard, Pierre Terrail, seigneur de
- Bayard, Thomas Francis
- Baybars I
- bayberry
- Bayda`, Al-
- Bayer AG
- Bayer, Friedrich
- Bayer, Herbert
- Bayer, Johann
- Bayerische Motoren Werke AG
- Bayes, Nora
- Bayes, Thomas
- Bayeu, Francisco
- Bayeux
- Bayeux Tapestry
- Bayezid I
- Bayezid II
- Bayinnaung
- Bayle, Pierre
- Baylebridge, William
- Baylis, Lilian Mary
- Bayliss, Sir William Maddock
- Baylor University
- Baylor, Elgin
- Baynes, Thomas Spencer
- bayonet
- Bayonne
- Bayreuth
- Bayrut
- Baytown
- Baza
- bazaar
- Bazaine, Achille (-François)
- Bazalgette, Sir Joseph William
- Bazaruto Island
- Bazille, Jean-Frédéric
- Bazin, Henri-Émile
- Bazin, Hervé
- Bazin, René (-François-Nicolas-Marie)
- Baziotes, William
- bazooka
- BCG vaccine
- BCS theory
- BD
- be
- beach
- beach grass
- beach pea
- Beach, Alfred Ely
- Beach, Amy Marcy
- Beach, Sylvia
- Beachy Head
- Beacon
- Beaconsfield
- bead
- bead lightning
- Beadle, George Wells
- beadwork
- Beagle
- Beagle Channel
- beak
- beak style
- beaked whale
- Beaker folk
- beam
- Beamon, Bob
- bean
- Bean, Alan L(aVern)
- Bean, Roy
- bear
- Bear Flag Revolt
- bear grass
- bear market
- bearbaiting
- bearberry
- beard lichen
- Beard, Charles A(ustin)
- bearded seal
- Bearden, Romare (Howard)
- beardfish
- Beardmore Glacier
- Beardsley, Aubrey (Vincent)
- beardworm
- bearing
- Béarn
- Bearsden and Milngavie
- Beartooth Range
- Beas River
- beast epic
- beat
- Beat movement
- Beata Ridge
- beatification
- Beatitude
- Beatles, the
- Beaton, David
- Beaton, James
- Beaton, Sir Cecil (Walter Hardy)
- Beatrice
- Beatrijs
- Beatrix
- Beattie, James
- Beatty, Clyde (Raymond)
- Beatty, David, 1ST EARL BEATTY, VISCOUNT BORODALE OF WEXFORD, BARON BEATTY OF THE NORTH SEA AND OF BROOKSBY
- Beatty, Sir (Alfred) Chester
- Beatus Rhenanus
- Beau Bassin-Rose Hill
- Beau de Rochas, Alphonse(-Eugène)
- Beaucaire
- Beauce
- Beauchamp, Alphonse de
- Beauchamp, Pierre
- Beauchemin, Nérée
- Beaudesert
- Beaufort
- Beaufort FAMILY
- Beaufort scale
- Beaufort Sea
- Beaufort Series
- Beaufort, François de Vendôme, duc de
- Beaufort, Henry
- Beaufort, Margaret
- Beaufre, André
- Beaugency
- Beauharnais, Alexandre, Viscount (vicomte) de
- Beauharnais, Eugène de
- Beauharnois
- Beaujolais
- Beaujoyeulx, Balthazar de
- Beaumarchais, Pierre-Augustin Caron de
- Beaumont
- Beaumont, (Jean-Baptiste-Armand-Louis-Léonce) Élie de
- Beaumont, Francis
- Beaumont, Sir John, 1ST BARONET
- Beaumont, William
- Beaune
- Beauport
- Beauregard, P.G.T.
- beauty bush
- beauty leaf
- Beauvais
- Beauvais tapestry
- Beauvoir, Simone (Lucie-Ernestine-Marie-Bertrand) de
- Beaux-Arts, École des
- Beaver
- Beaver Island
- Beaverbrook (of Beaverbrook and of Cherkley), Sir (William) Maxwell Aitken, 1st Baron, 1ST BARONET
- Beawar
- Bebel, August
- Bebey, Francis
- bebop
- becard
- Beccafumi, Domenico
- Beccaria, Cesare
- Beccles
- Béchar
- Beche, Sir Henry Thomas De La
- bêche-de-mer
- Becher, Johann Joachim
- Becher, Johannes Robert
- Bechet, Sidney
- Bechtel, Friedrich
- Bechtel, Stephen D(avison)
- Beck, Józef
- Beck, Ludwig
- Beck, Max Wladimir, Baron (Freiherr) von
- Becke, Friedrich Johann Karl
- Beckenbauer, Franz
- Becker, Boris
- Becker, Carl (Lotus)
- Becker, Gary S.
- Becker, George Ferdinand
- Becker, Wilhelm Adolf
- Becket, Frederick Mark
- Becket, Saint Thomas
- Beckett, Samuel (Barclay)
- Beckford, William
- Beckley
- Beckmann, Max
- Becknell, William
- Beckwourth, Jim
- Becque, Henry-François
- Bécquer, Gustavo Adolfo
- Becquerel, (Antoine-)Henri
- bed
- Bedaux, Charles Eugene
- bedbug
- Bedde
- Beddoes, Thomas Lovell
- Bede the VENERABLE, SAINT
- Bedford
- Bedford, EARLS AND DUKES OF
- Bedford, Francis Russell, 2nd earl of
- Bedford, Francis Russell, 4th earl of
- Bedford, Francis Russell, 5th duke of
- Bedford, Jasper Tudor, duke of, EARL OF PEMBROKE
- Bedford, John Plantagenet, duke of
- Bedford, John Robert Russell, 13th duke of
- Bedford, John Russell, 1st earl of
- Bedford, John Russell, 4th duke of
- Bedford, William Russell, 1st duke and 5th earl of
- Bedfordshire
- Bédier, (Charles-Marie-) Joseph
- Bedlam
- Bedlington terrier
- Bedlingtonshire
- Bedmar, Alonso de la Cueva, Marqués de
- Bednorz, J(ohannes) Georg
- Bedny, Demyan
- Bedouin
- Bedreddin
- bedsore
- bedspread
- bedstraw
- Bedworth
- Bedzin
- bee
- bee fly
- bee plant
- bee-eater
- Beebe, (Charles) William
- beech
- Beecham, Sir Thomas, 2ND BARONET
- Beecher, Catharine Esther
- Beecher, Henry Ward
- Beecher, Lyman
- Beechworth
- Beecroft, John
- beef
- beehive house
- Beehive, The
- beekeeping
- Beelzebub
- beer
- Beer Hall Putsch
- Beer, Israel
- Beer, Wilhelm
- Beerbohm, Sir Max
- Beernaert, Auguste-Marie-François
- Beersheba
- Beery, Wallace (Fitzgerald)
- Beeston and Stapleford
- Beeston, Christopher
- beeswax
- beet
- beetle
- Beets, Nicolaas
- Befana
- Beg-tse
- Bega
- Begas, Reinhold
- Begin, Menachem
- begonia
- Begoniaceae
- Beguines
- Begusarai
- Behaghel, Otto
- Behaim, Martin
- Beham, Hans Sebald
- Behan, Brendan (Francis)
- behavioral science
- behaviour genetics
- behaviour therapy
- behaviourism
- Behbehan
- beheading
- Behemoth
- Behn, Aphra
- Behn, Sosthenes
- Behrens, Peter
- Behring, Emil (Adolf) von
- Behrman, S(amuel) N(athaniel)
- Behzad
- Beiderbecke, Bix
- Beilby, Sir George Thomas
- Beilstein, Friedrich Konrad
- Beinum, Eduard (Alexander) van
- Beira
- Beirut
- Beirut, American University of
- beisa
- Beissel, Conrad
- Beit Bridge
- Beja
- Bejaïa
- Béjart FAMILY
- Béjart, Maurice
- bejel
- Bekabad
- Beke, Charles Tilstone
- Békés
- Békéscsaba
- Békésy, Georg von
- Bekhterev, Vladimir
- Bekker, August Immanuel
- Bektashi
- Bel
- Bel and the Dragon
- bel canto
- bel fruit
- Béla III
- Béla IV
- Bélain, Pierre, SIEUR D'ESNAMBUC
- Belalcázar, Sebastián de
- Belarus
- Belasco, David
- Belaúnde Terry, Fernando
- Belawan
- Belaya Tserkov
- Belchatów
- Belcher Islands
- Belcher, Jonathan
- Belcher, Sir Edward
- Belcredi, Richard, Count
- Belém
- belemnoid
- Belenus
- Bélep, Îles
- Belfast
- Belfast Lough
- Belfort
- Belfort, Territoire de
- belfry
- Belgae
- Belgaum
- Belgian Congo
- Belgian horse
- Belgian sheepdog
- Belgic Confession
- Belgica
- Belgioioso
- Belgium
- Belgorod
- Belgorod-Dnestrovsky
- Belgrade
- Belgrade, Treaty of
- Belgrano, Manuel
- Belidor, Bernard Forest de
- belief
- Belin, Édouard
- Belinsky, Vissarion Grigoryevich
- Belisarius
- Belit
- Beliveau, Jean (Marc A.)
- Belize
- Belize City
- Belize River
- Belknap
- bell
- Bell Bay
- bell chime
- Bell Island
- Bell Laboratories
- bell pepper
- Bell Rock
- Bell System
- Bell Trade Act
- Bell, Alexander Graham
- Bell, Andrew
- bell, book, and candle
- Bell, Charles Frederic Moberly
- Bell, Clive
- Bell, Cool Papa
- Bell, Daniel
- Bell, Eric Temple
- Bell, George Kennedy Allen
- Bell, Gertrude (Margaret Lowthian)
- Bell, Henry
- Bell, John
- Bell, Josephine
- Bell, Lawrence Dale
- Bell, Sir Charles
- Bell, Sir Francis Henry Dillon
- bell-magpie
- Bella Coola
- Bella, Stefano della
- belladonna
- Bellah, Robert Neelly
- Bellamy, Edward
- Bellamy, Ralph
- Bellanca, Giuseppe Mario
- Bellarmine, Saint Robert
- Bellary
- Bellay, Guillaume du, SEIGNEUR (lord) DE LANGEY
- Bellay, Jean du
- Bellay, Joachim du
- bellbird
- Belle Fourche
- Belle Glade
- Belle Isle, Strait of
- Belle-Île-en-Mer
- Belle-Isle, Charles (-Louis-Auguste) Fouquet, duc de (duke of), DUC DE GISORS
- Belleau, Rémy
- Bellecour
- Bellecour, Madame
- Belleek ware
- Bellefontaine
- Bellenden Ker Range
- Bellenden, John
- Bellerophon
- Belleville
- Bellevue
- bellflower
- Belli, Carlos Germán
- Belli, Giuseppe Gioacchino
- Belli, Pierino
- belligerency
- Bellingham
- Bellingshausen, Fabian Gottlieb von
- Bellini, Gentile
- Bellini, Giovanni
- Bellini, Jacopo
- Bellini, Lorenzo
- Bellini, Vincenzo
- Bellinzona
- Bellman, Carl Michael
- Bello
- Bello, Andrés
- Belloc, (Joseph-Pierre) Hilaire
- Bellona
- Bellotto, Bernardo
- Bellow, Saul
- bellows
- Bellows Falls
- Bellows, George Wesley
- Belluno
- Belluschi, Pietro
- Bellville
- bellwort
- Belmondo, Jean-Paul
- Belmont
- Belmont FAMILY
- Belmont Stakes
- Belmont, Alva
- Belmonte, Juan
- Belmopan
- Belo Horizonte
- Beloeil
- Belogorsk
- Beloit
- Beloit College
- Belon, Pierre
- Beloretsk
- Belorussian language
- Belorussian Ridge
- Belousov, Vladimir
- Belovezhskaya Forest
- Belovo
- Belper
- Belshazzar
- belt drive
- Belt Series
- Belter, John Henry
- Beltrami, Eugenio
- Beltrán, Pedro Gerado
- beluga
- Belukha, Mount
- belvedere
- Belvedere Torso
- Belvidere
- Bely Gorod
- Bely, Andrey
- Belyayev, Pavel
- Belzec
- Belzoni, Giovanni Battista
- Bem, Jósef Zachariasz
- bema
- Bemba
- Bembo, Pietro
- Bemidji
- Bemmelen, Reinout Willem van
- Ben Barka, Mehdi
- Ben Bella, Ahmed
- Ben Jelloun, Tahar
- Ben Lomond
- Ben Nevis
- Ben Rinnes
- Ben Slimane
- Ben Thuy
- Ben Tre
- Ben Wyvis
- Ben-Gurion, David
- Ben-hadad I
- Ben-Zvi, Itzhak
- Benacerraf, Baruj
- Benadir
- Benalla
- Benaud, Richie
- Benavente y Martínez, Jacinto
- Benbecula
- Benbow, John
- bench
- Bench, Johnny (Lee)
- Benchley, Robert (Charles)
- Benckendorff, Aleksandr Khristoforovich, Count
- Bend
- Benda, Frantisek
- Benda, Georg (Anton)
- Benda, Julien
- Benda, Wladyslaw Theodor
- bendahara
- Bender, Charles Albert
- Bendigo
- Bendis
- Bendix Corporation
- Bendix, Vincent
- Bene Beraq
- Bene-Israel
- Benedek, Ludwig August, Ritter von
- Beneden, Edouard (Joseph Louis-Marie) van
- Beneden, Pierre-Joseph van
- Benedetti, Mario
- Benedetti, Vincent, Comte
- Benedetto DA MAJANO
- Benedict (X)
- Benedict (XIII)
- Benedict (XIV)
- Benedict BISCOP, SAINT
- Benedict I
- Benedict II, SAINT
- Benedict III
- Benedict IV
- Benedict IX
- Benedict OF NURSIA, SAINT
- Benedict V
- Benedict VI
- Benedict VII
- Benedict VIII
- Benedict XI, BLESSED
- Benedict XII
- Benedict XIII
- Benedict XIV
- Benedict XV
- Benedict, Ruth
- Benedictine
- benediction
- Benedictsson, Victoria
- Benedictus
- Benediktsson, Einar
- benefice
- beneficiary
- beneficiation
- benefit performance
- Beneke, Friedrich Eduard
- Benelux Countries
- Benelux Economic Union
- Benes, Edvard
- Benet Goita, Juan
- Benét, Stephen Vincent
- Beneventan script
- Benevento
- benevolence
- Benezet, Anthony
- Bénézet, SAINT
- Benfey, Theodor
- Bengal
- Bengal, Bay of
- Bengal, Partition of
- Bengali language
- Bengali literature
- Bengel, J(ohann) A(lbrecht)
- Bengkalis Island
- Bengkulu
- Bengtsson, Frans Gunnar
- Benguela
- Benguela Current
- Beni Abbès
- Beni Hasan
- Beni Isguene
- Beni Mellal
- Beni River
- Beni Saf
- beni-e
- Benin
- Benin City
- Benin, Bight of
- Benivieni, Girolamo
- Benjamin
- Benjamin OF TUDELA
- Benjamin, Asher
- Benjamin, Judah P(hilip)
- Benjamin, Walter
- Benkei
- Benlowes, Edward
- Benn, Gottfried
- Benn, Sir Ernest John Pickstone, 2ND BARONET
- Benn, Tony
- Bennet, John
- Bennett (of Mickleham and of Calgary and Hopewell), Richard Bedford Bennett, Viscount
- Bennett, (Enoch) Arnold
- Bennett, Floyd
- Bennett, James Gordon
- Bennett, Jill
- Bennett, Joan (Geraldine)
- Bennett, Michael
- Bennett, Richard Rodney
- Bennett, Sir William Sterndale
- Bennett, Willard Harrison
- Bennigsen, (Karl Wilhelm) Rudolf von
- Bennigsen, Leonty Leontyevich, Graf von
- Bennington
- Bennington, Battle of
- Benno, SAINT
- Benny, Jack
- Benois, Alexandre
- Benoît DE SAINTE-MAURE
- Benoit, Peter
- Benoni
- Benserade, Isaac de
- Benson, E.F.
- Benson, Edward White
- Benson, Sir Frank
- bent grass
- Bent, Charles
- Bent, James Theodore
- Benten
- Bentham, George
- Bentham, Jeremy
- Bentham, Sir Samuel
- benthos
- Benti
- Bentinck, Lord George
- Bentinck, Lord William
- Bentivoglio FAMILY
- Bentivoglio, Guido
- Bentley College
- Bentley, Arthur F(isher)
- Bentley, E(dmund) C(lerihew)
- Bentley, Eric (Russell)
- Bentley, Richard
- Bento Gonçalves
- Bentol
- Benton
- Benton Harbor
- Benton, Thomas Hart
- Benton, William (Burnett)
- Bentong
- bentonite
- bentwood furniture
- Benue
- Benue River
- Benue-Congo languages
- Benz, Karl (Friedrich)
- benzaldehyde
- benzene
- benzene hexachloride
- Benzer, Seymour
- benzidine
- benzoic acid
- benzoquinone
- benzyl alcohol
- Beorhtric
- Beothuk
- Beowulf
- Beppu
- Berain, Jean, THE ELDER
- berakah
- Béranger, Pierre-Jean de
- Berar
- Berat
- Berazategui
- Berber
- Berber languages
- Berbera
- Berberidaceae
- Berbice River
- Berceo, Gonzalo de
- berceuse
- Berchem, Nicolaes Pietersz(oon)
- Berchtesgaden
- Berchtold, Leopold, Count (Graf) von
- Berdichevsky, Micah Joseph
- Berdsk
- Berdyansk
- Berdyayev, Nikolay Aleksandrovich
- Berdychiv
- Bérégovoy, Pierre
- Berengar
- Berengar II
- Berengar OF TOURS
- Berengario da Carpi, Jacopo
- Bérenger, Alphonse-Marie
- Berenguer (y Fusté), Dámaso, Count (conde) DE XAUEN
- Berenice
- Berenice I
- Berenice II
- Berenice III
- Berenice IV
- Berenson, Bernard
- Berent, Waclaw
- Beresford, Charles William de la Poer Beresford, 1st Baron
- Beresford, John
- Beresford, William Carr Beresford, Viscount, BARON BERESFORD OF ALBUERA AND DUNGARVAN, DUKE (duque) DE ELVAS
- Beresteczko, Battle of
- Beretta SpA
- Berezina River
- Berezniki
- Berg
- Berg, Alban
- Berg, Lev Simonovich
- Berg, Patty
- Berg, Paul
- Bergama
- Bergama carpet
- bergamasca
- Bergamo
- bergamot
- Berganza, Teresa
- Bergbom, Kaarlo
- Bergdama
- Bergen
- Bergen op Zoom
- Bergen, Edgar
- Bergen-Belsen
- Berger, Victor (Louis)
- Bergerac
- Bergeron, Tor Harold Percival
- Bergey, David Hendricks
- Bergisch Gladbach
- Bergisches Land
- Bergius, Friedrich
- Bergman, (Ernst) Ingmar
- Bergman, Bo Hjalmar
- Bergman, Hjalmar Fredrik Elgérus
- Bergman, Ingrid
- Bergman, Torbern Olof
- Bergmann's Rule
- Bergmann, Ernst (Gustav Benjamin) von
- Bergner, Elisabeth
- bergschrund
- Bergslagen
- Bergson, Henri(-Louis)
- Bergström, Sune K.
- Beria, Lavrenty Pavlovich
- beriberi
- Bering Canyon
- Bering Sea
- Bering Sea Dispute
- Bering Strait
- Bering, Vitus (Jonassen)
- Berio, Luciano
- Beriosova, Svetlana
- Bériot, Charles-Auguste de
- Berke
- Berkeley
- Berkeley, Busby
- Berkeley, George
- Berkeley, Sir Lennox
- Berkeley, Sir William
- berkelium
- Berkhamsted
- Berkner, Lloyd Viel
- Berks
- Berkshire
- Berkshire Hills
- Berlage, Hendrik Petrus
- Berle, Milton
- Berlichingen, Götz von
- Berlin
- Berlin blockade and airlift
- Berlin Painter
- Berlin Wall
- Berlin ware
- Berlin West Africa Conference
- Berlin woolwork
- Berlin Zoo
- Berlin Zoological Garden and Aquarium
- Berlin, Congress of
- Berlin, Free University of
- Berlin, Humboldt University of
- Berlin, Irving
- Berlin, Isaiah ben Judah Loeb
- Berlin, Sir Isaiah
- Berlin-Dahlem Botanical Garden and Botanical Museum
- Berliner Ensemble
- Berliner, Emil
- Berlinghieri, Bonaventura
- Berlingske Tidende
- Berlinguer, Enrico
- Berlioz, (Louis-)Hector
- berm
- Bermejo Pass
- Bermejo River
- Bermejo, Bartolomé
- Bermuda
- Bermuda grass
- Bermuda high
- Bermuda Race
- Bermuda Triangle
- Bern
- Bernadette OF LOURDES, SAINT
- Bernadotte (af Wisborg), Folke, Greve
- Bernadotte, HOUSE OF
- Bernal, John Desmond
- Bernalillo
- Bernanos, Georges
- Bernard DE CHARTRES
- Bernard DE CLAIRVAUX, SAINT
- Bernard DE CLUNY
- Bernard DE MENTHON, SAINT
- Bernard DE VENTADOUR
- Bernard, Claude
- Bernard, Émile
- Bernard, Jean-Jacques
- Bernard, Jessie
- Bernard, Samuel, COUNT (comte) DE COUBERT
- Bernard, Tristan
- Bernardin de Saint-Pierre, Jacques-Henri
- Bernardine OF SIENA, SAINT
- Bernays, Edward L.
- Bernays, Paul
- Bernbach, William
- Bernburg
- Berne Convention
- Berners, John Bourchier, 2nd Baron
- Bernese Alps
- Bernese mountain dog
- Bernhard
- Bernhard, PRINCE OF THE NETHERLANDS, PRINCE OF LIPPE-BIESTERFELD
- Bernhard, Thomas
- Bernhardt, Sarah
- Berni, Francesco
- Bernicia
- Bernina Alps
- Bernini, Gian Lorenzo
- Bernini, Pietro
- Bernis, François-Joachim de Pierre de
- Bernkastel-Kues
- Bernoulli's theorem
- Bernoulli, Daniel
- Bernoulli, Jakob
- Bernoulli, Johann
- Bernstein, Eduard
- Bernstein, Henry (-Léon-Gustave-Charles)
- Bernstein, Jeremy
- Bernstein, Leonard
- Bernstorff, Albrecht, Count (Graf) von
- Bernstorff, Andreas Peter, Count (Graf) von
- Bernstorff, Christian Günther, Count (Graf) von
- Bernstorff, J.H.E., Count (Graf) von
- Bernstorff, Johann-Heinrich, Count (Graf) von
- Berosus
- Berr, Henri
- Berra, Yogi
- Berriasian Stage
- Berruguete, Alonso
- Berruguete, Pedro
- Berry
- Berry, Charles-Ferdinand de Bourbon, duc de (duke of)
- Berry, Chuck
- Berry, Jean de France, duc de
- Berry, Marie-Caroline de Bourbon-Sicile, duchesse de (duchess of)
- Berryer, Pierre-Antoine
- Berryman, John
- berserker
- Bert, Paul
- Bertani, Agostino
- Bertaut, Jean de Caen
- Berthelier, Philibert
- Berthelot, (Pierre-Eugène-) Marcellin
- Berthelot, Philippe (-Joseph-Louis)
- Berthier, Louis-Alexandre, PRINCE DE WAGRAM
- Berthold DER SCHWARZE
- Berthold VON HENNEBERG
- Bertholet, Alfred
- Berthollet, Claude-Louis, Comte
- Berthoud, Ferdinand
- Bertillon, Alphonse
- Bertillon, Jacques
- Bertinoro, Obadiah (ben Abraham Yare) of
- Bertoia, Harry
- Bertoldo DI GIOVANNI
- Bertolucci, Bernardo
- Bertran DE BORN
- Bertrand, Henri-Gratien, Comte
- Bertrand, Joseph(-Louis-François)
- Bertrand, Louis(-Jacques-Napoléon)
- Bertrand, Marcel-Alexandre
- Bérulle, Pierre de
- Berwald, Franz (Adolf)
- Berwick-upon-Tweed
- Berwick-upon-Tweed, James Fitzjames, Duke of, EARL OF TINMOUTH, BARON OF BOSWORTH, DUC (duke) DE FITZ-JAMES
- Berwickshire
- Berwinski, Ryszard Wincenty
- beryl
- berylliosis
- beryllium
- Berzelius, Jöns Jacob
- Berzsenyi, Dániel
- Bes
- Besançon
- Besant, Annie
- Besant, Sir Walter
- Beskid Mountains
- bess beetle
- Bessa Luís, Maria Agustina
- Bessa Victor, Geraldo
- Bessarabia
- Bessarion, John
- Bessel function
- Bessel, Friedrich Wilhelm
- Bessemer
- Bessemer process
- Bessemer, Sir Henry
- Bessey, Charles E.
- Bessières, Jean-Baptiste, DUC (duke) D'ISTRIE
- Besson, Jacques
- Bessus
- Best Friend of Charleston
- best of all possible worlds
- Best, Charles H(erbert)
- best-seller
- bestiary
- Bestuzhev-Ryumin, Aleksey Petrovich, Count
- Bet Alfa
- bet din
- Bet She'arim
- Bet She`an
- beta blocker
- Beta Centauri
- beta decay
- Beta Lyrae
- beta particle
- beta-aminoisobutyric acid excretion
- Betancourt, Rómulo
- betatron
- betel
- Betelgeuse
- Beth Yerah
- Bethanie
- Bethany
- Bethe, Hans Albrecht
- Bethel
- Béthencourt, Jean de
- Bethesda-Chevy Chase
- Bethlehem
- Bethlehem Steel Corporation
- Bethlehem, Star of
- Bethlen, Gábor
- Bethlen, István, Count
- Bethmann Hollweg, Theobald von
- Béthune
- Bethune, Louise Blanchard
- Bethune, Mary McLeod
- Beti, Mongo
- Betjeman, Sir John
- Betpak-Dala
- betrothal
- Betsileo
- Betsimisaraka
- Bettelheim, Bruno
- Better Business Bureau
- Betterton, Thomas
- Betterton-Kroll process
- Betti, Enrico
- Betti, Ugo
- Bettiah
- Betty, William Henry West
- Betul
- Betulaceae
- Betwa River
- Beust, Friedrich Ferdinand, Graf von
- Beuve-Méry, Hubert
- Beuys, Joseph
- Bevan, Aneurin
- Beveridge (of Tuggal), William Henry Beveridge, 1st Baron
- Beveridge, Albert J.
- Beverly
- Beverly Hills
- Bevin, Ernest
- Bewcastle Cross
- Bewick, Thomas
- Bexhill
- Bexley
- bey
- Beyer, Absalon Pederssøn
- Beyer-Garratt
- Beyers, C.F.
- Beyla
- Beza, Theodore
- Bezborodko, Aleksandr Andreyevich, Knyaz
- Béziers
- Bezique
- Bezruc, Petr
- Bhadrabahu I
- Bhadracarya-pranidhana
- Bhadravati
- Bhagalpur
- Bhagavadgita
- Bhagavata
- Bhagavata-Purana
- Bhagirathi River
- bhaiband
- Bhaisajya-guru
- Bhaktapur
- bhakti
- Bhaktivedanta, A(bhay) C(haranaravinda)
- Bhamo
- bhanavara
- Bhandara
- Bhander Plateau
- bhangra
- bharata natya
- Bharati, Subrahmanya C.
- Bharatpur
- Bharhut
- Bharhut sculpture
- Bhartrhari
- Bharuch
- Bhasa
- Bhaskara II
- bhasya
- Bhatinda
- Bhatpara
- bhava
- bhava-cakra
- Bhavabhuti
- Bhave, Vinoba
- Bhavnagar
- bhedabheda
- Bhêly-Quénum, Olympe
- bhikku
- Bhil
- Bhilai Nagar
- Bhilwara
- Bhima River
- Bhind
- Bhir
- Bhiwani
- Bhojpur
- Bhonsle DYNASTY
- Bhopal
- Bhubaneswar
- Bhuj
- bhumi
- Bhumibol Adulyadej
- Bhusawal
- bhut
- Bhutan
- Bhutia
- Bhutto, Benazir
- Bhutto, Zulfikar Ali
- Bia River
- Biafra
- Biafra, Bight of
- Biak Island
- Biala Podlaska
- Bialik, Hayyim Nahman
- Bialystok
- bianco sopra bianco
- Biankouma
- Biarritz
- biathlon
- bib
- Bibai
- Bibaud, Michel
- Biber, Heinrich
- Bibiena, Galli da, FAMILY
- Bible
- biblical criticism
- bibliography
- Bibliothèque Nationale
- Bibracte
- Bibulus, Marcus Calpurnius
- bicameral system
- bicarbonate of soda
- Bicaz
- biceps muscle
- Bicester
- Bichat, Marie-François-Xavier
- bichir
- Bichitr
- bichloride of mercury
- Bickerdyke, Mary Ann
- Bickerstaffe, Isaac
- Bicol
- Bicol Peninsula
- bicycle
- bid'ah
- Bida
- Bidar
- Bidault, Georges (-Augustin)
- Biddeford
- Biddle, James
- Biddle, John
- Biddle, Nicholas
- Bideford
- Bidens
- Bidlack Treaty
- Bidpai, The Fables of
- Bidri ware
- Bidwell, John
- Bié
- Bieber, Owen (Frederick)
- Biedermeier style
- Biel
- Biel, Gabriel
- Biela's Comet
- Bielefeld
- Biella
- Bielsko-Biala
- Bien Hoa
- Biencourt, Charles de, BARON DE SAINT-JUST
- Bienerth, Richard, Freiherr von
- Bienville, Jean-Baptiste Le Moyne de
- Bierce, Ambrose (Gwinnett)
- bieri
- Bierstadt, Albert
- Bierut, Boleslaw
- big apple
- Big Belt Mountains
- Big Ben
- Big Bend National Park
- Big Bertha
- Big Black River, Battle of
- Big Boy
- Big Cypress Swamp
- Big Dipper, The
- Big Eight Conference
- Big Sandy River
- Big Sioux River
- Big Spring
- Big Stick Policy
- Big Stone Lake
- Big Sur
- Big Ten Conference
- big tree
- big-bang model
- Big-Game Hunting culture
- Bigelow, Erastus Brigham
- Bigelow, John
- bigeye
- Biggs, E(dward George) Power
- bighorn
- Bighorn Mountains
- Bighorn River
- Bignoniaceae
- Bigot, François
- Bigsby, John Jeremiah
- Bihac
- Bihar
- Bihar Sharif
- Bihari languages
- Bihor
- Bihor Massif
- Bijagós Islands
- Bijapur
- Bijar carpet
- Bijnor
- Bikaner
- bike wagon
- Bikini
- Biko, (Bantu) Stephen
- Bilaspur
- Bilbao
- Bilbays
- bilberry
- Bilbo, Theodore G(ilmore)
- Bildad
- Bilderberg Conference
- Bilderdijk, Willem
- Bildungsroman
- bile
- Bilecik
- Bilfinger, Georg Bernhard
- Bilge
- bilin
- bilirubin
- Bill, Max
- Billaud-Varenne, Jean-Nicolas
- billbergia
- billbug
- Billetdoux, François
- billfish
- billiards
- Billings
- Billings, John Shaw
- Billings, Josh
- Billings, William
- Billingsgate
- Billiton
- Billroth, Theodor
- Billung DYNASTY
- Billy THE KID
- Biloxi
- Bilston enamelware
- bimah
- Bimbisara
- bimetallism
- Bimini Islands
- binary form
- binary number system
- binary star
- Binche
- Binchois, Gilles
- binder
- binding energy
- bindweed
- Binet, Alfred
- Bing Xin
- Bing, Sir Rudolph
- Bingen
- Bingerville
- Bingham, Caleb
- Bingham, George Caleb
- Bingham, Hiram
- Binghamton
- bingo
- Bingöl
- Binkis, Kazys
- Binney, Horace
- Binney, Thomas
- Binnig, Gerd
- Binnya Dala
- binocular
- binomial theorem
- Binswanger, Ludwig
- binturong
- Binyon, (Robert) Laurence
- Bío-Bío
- Bío-Bío River
- biochemical oxygen demand
- biochemistry
- bioclimatology
- bioelectricity
- bioengineering
- bioethics
- biofeedback
- biogenetic law
- biogeochemical cycle
- biogeography
- Biograph Company
- biography
- bioherm
- Bioko
- biolith
- biological control
- biological rhythm
- biological warfare
- biology
- bioluminescence
- biomass
- biome
- biomechanics
- Bion
- Bion OF BORYSTHENES
- Biondo, Flavio
- bionics
- biophysics
- biopoiesis
- biopsy
- Biosatellite
- biosphere
- Biot, Jean-Baptiste
- Biot-Savart law
- biotechnology
- biotic interaction
- biotic potential
- biotin
- biotite
- Bioy Casares, Adolfo
- biozone
- biphenyl
- biplane
- bipolar cell
- Biqa', Al-
- Birah, Al-
- Birak
- Birak, Tall
- Biratnagar
- Birbhum
- birch
- birch mouse
- bird
- Bird Island
- bird louse
- bird of prey
- bird rug
- bird song
- bird stone
- bird's-foot trefoil
- bird's-nest orchid
- Bird, (Cyril) Kenneth
- Bird, Robert Montgomery
- bird-of-paradise
- bird-of-paradise flower
- bird-watching
- Birdseye, Clarence
- Birendra Bir Bikram Shah Dev
- biretta
- Birganj
- Birger JARL
- Birger MAGNUSSON
- Biringuccio, Vannoccio
- biritch
- Birjand
- Birka
- Birkarlar
- Birkbeck, George
- Birkenhead
- Birkenhead, Frederick Edwin Smith, 1st Earl of, VISCOUNT FURNEAUX OF CHARLTON, VISCOUNT BIRKENHEAD OF BIRKENHEAD, BARON BIRKENHEAD OF BIRKENHEAD
- Birkenia
- Birkhoff, George David
- birling
- Birmingham
- Birmingham enamelware
- Birney, James Gillespie
- Birnin Kebbi
- Birnin Kudu
- Birobidzhan
- Biron, Armand de Gontaut, Baron de
- Biron, Armand-Louis de Gontaut, duc de (duke of)
- Biron, Charles de Gontaut, Baron and Duke (duc) de
- Biron, Ernst Johann, Reichsgraf von
- Birr
- Birrell, Augustine
- birth control
- birth defect
- birth rate
- birthmark
- birthstone
- birthwort
- Biruni, al-
- Birzebbuga
- Bisaya
- Bisbee
- Biscay, Bay of
- Biscayne Bay
- Biscayne National Park
- Bisceglie
- Bischof, Werner
- biscuit
- bisexuality
- Bishamon
- Bishandas
- Bishkek
- Bishnupur
- bishop
- Bishop Hill
- Bishop Museum
- Bishop Rock Lighthouse
- bishop's cap cactus
- Bishop's Stortford
- Bishop, Elizabeth
- Bishop, J(ohn) Michael
- Bishop, John Peale
- Bishop, Sir Henry Rowley
- Bishop, William Avery
- Bishops' Wars
- Bishops, Synod of
- Bisitun
- bisj pole
- Biskra
- Bismarck
- Bismarck Archipelago
- Bismarck Range
- Bismarck Sea
- bismuth
- bismutite
- bison
- Bissau
- Bissell, Melville Reuben
- Bissell, Richard (Pike)
- Bissorã
- bistre
- Bistrita
- Bistrita-Nasaud
- bit
- Bit-Adini
- Bithur
- Bithynia
- biting midge
- Bitis
- Bitlis
- Bitola
- Biton and Cleobis
- Bitonto
- Bitter Springs microfossils
- bitterling
- bittern
- bitterroot
- Bitterroot Range
- bitters
- bittersweet
- bitumen
- bituminous coal
- Bituriges
- Bitzer, Billy
- Biu
- Biu Plateau
- bivalve
- biwa
- Biwa, Lake
- Biysk
- Bizen ware
- Bizet, Georges
- Bizzozero, Giulio
- Bjerknes, Jacob (Aall Bonnevie)
- Bjerknes, Vilhelm F(riman) K(oren)
- Björketorp Stone
- Björling, Jussi (Johan Jonaton)
- Bjørneboe, Jens (Ingvald)
- Bjørnson, Bjørnstjerne Martinius
- Björnsson, Sveinn
- Björnstrand, Gunnar
- Bka'-'gyur
- Bka'-brgyud-pa
- BL Public Limited Company
- Blaby
- Blacher, Boris
- Black and Tan
- Black Bart
- black bass
- black bear
- Black Belt
- Black Canyon of the Gunnison National Monument
- black code
- Black Country
- Black Death
- black duck
- black fly
- Black Forest
- Black Friday
- Black Hand
- Black Hawk
- Black Hills
- black hole
- Black Hole of Calcutta
- black humour
- Black Hundreds
- black knot
- black lead
- black letter
- black lung
- black market
- black mass
- Black Mountain poet
- Black Mountains
- black nationalism
- black oak
- Black Obelisk
- Black Panther Party
- black pepper
- black powder
- Black Prince's ruby
- Black River
- Black Riveran Stage
- Black Rock Desert
- Black Rod
- black sand
- Black Sea
- black shale
- black shark
- black snake
- Black Sox Scandal
- black spot
- black state
- Black Stone of Mecca
- black theatre
- black varnish
- Black Volta River
- black walnut
- Black War
- Black Warrior River
- black widow
- Black, Davidson
- Black, Eugene Robert
- Black, George
- Black, Harold Stephen
- Black, Hugo (La Fayette)
- Black, Jeremiah Sullivan
- Black, Joseph
- Black, Max
- Black, Sir James (Whyte)
- black-figure pottery
- black-tailed deer
- blackberry
- blackberry lily
- blackbird
- blackbirding
- blackbody
- blackbuck
- Blackburn
- Blackburn, Gideon
- Blackburn, Helen
- Blackburn, Joseph
- Blackburn, Thomas
- blackcap
- Blackett, Patrick M(aynard) S(tuart)
- blackfish
- Blackfoot
- Blackfriars Theatre
- Blackheath
- Blackjack
- Blackmore, Richard Doddridge
- Blackmore, Sir Richard
- Blackmun, Harry Andrew
- blackpoll warbler
- Blackpool
- Blackrock
- Blackshirt
- blacksmith
- Blackstone River
- Blackstone, Sir William
- blackthorn
- blacktip shark
- Blackton, J(ames) Stuart
- Blackwater
- blackwater fever
- Blackwater, River
- Blackwell, Alice Stone
- Blackwell, Antoinette Brown
- Blackwell, Edward Joseph
- Blackwell, Elizabeth
- Blackwell, John
- Blackwood, Algernon Henry
- Blackwood, William
- bladder
- bladdernut
- bladderwort
- Blaenau Gwent
- Blagoevgrad
- Blagoveshchensk
- Blaik, Earl Henry
- Blaine, James G(illespie)
- Blainey, Geoffrey (Norman)
- Blair
- Blair, Francis P(reston)
- Blair, Francis Preston, Jr..
- Blair, Henry William
- Blair, James
- Blair, John
- Blair, Robert
- Blais, Marie-Claire
- Blaise, SAINT
- Blaize, Herbert Augustus
- Blake, Edward
- Blake, Eubie
- Blake, Eugene Carson
- Blake, George
- Blake, Lyman Reed
- Blake, Robert
- Blake, William
- Blakelock, Ralph Albert
- Blakeslee, Albert Francis
- Blakey, Art
- Blalock, Alfred
- Blanc, Louis
- Blanc, Mel
- Blanc, Mont
- Blanchard, Jean-Pierre-François
- Blanchard, Thomas
- Blanche OF CASTILE
- Blanchet FAMILY
- Blanco-Fombona, Rufino
- Blanda, George (Frederick)
- Blanding's turtle
- Blandrata, Georgius
- Blane, Sir Gilbert, 1ST BARONET
- blank verse
- Blanqui, (Louis-)Auguste
- Blanqui, Adolphe
- Blantyre
- Blarney
- Blaschka glass
- Blaschke, Wilhelm Johann Eugen
- Blasco Ibáñez, Vicente
- Blasis, Carlo
- Blaskowitz, Johannes
- blasphemy
- blast furnace
- Blastares, Matthew
- blastema
- blasting
- blasting cap
- blastocyst
- blastoid
- blastomycosis
- blastopore
- blastula
- Blatch, Harriot Eaton Stanton
- Blatchford, Samuel
- Blaue Reiter, Der
- Blavatsky, Helena Petrovna
- bleach
- bleak
- Bled, Lake
- bleeding heart
- Bleeding Kansas
- Bleek, Wilhelm (Heinrich Immanuel)
- Blegen, Carl (William)
- Blekinge
- blended whiskey
- blending
- Blenheim
- Blenheim Palace
- Blenheim, Battle of
- Blenkinsop, John
- blenny
- blepharitis
- blepharochalasis
- Blériot, Louis
- blesmol
- Blessing Way
- Blessington, Marguerite Gardiner, Countess of
- Blest Gana, Alberto
- Bleuler, Eugen
- Blicher, Steen Steensen
- Blida
- Bligh, William
- blight
- blimp
- blind fish
- blind snake
- blind spot
- blind staggers
- blindman's buff
- blindness
- blindworm
- Bliss Classification
- Bliss, Gilbert Ames
- Bliss, Nathaniel
- Bliss, Sir Arthur (Edward Drummond)
- Bliss, Tasker Howard
- Bliss, William D(wight) P(orter)
- blister
- blister beetle
- Blitar
- blitzkrieg
- Blitzstein, Marc
- blizzard
- bloat
- Bloc National
- Bloch, Ernest
- Bloch, Ernst
- Bloch, Felix
- Bloch, Jean-Richard
- Bloch, Joseph Samuel
- Bloch, Konrad (Emil)
- Bloch, Marc (Léopold Benjamin)
- block and tackle
- block book
- Block Island
- blockade
- Bloemaert, Abraham
- Bloembergen, Nicolaas
- Bloemfontein
- Blois
- Blok, Aleksandr Aleksandrovich
- Blom, Frans Ferdinand
- Blomberg, Werner (Eduard Fritz) von
- blonde lace
- Blondel DE NESLE
- Blondel, André-Eugenè
- Blondel, Georges
- Blondel, Jacques-François
- Blondel, Maurice (Édouard)
- Blondin
- blood
- blood analysis
- blood bank
- blood brotherhood
- blood cell formation
- blood count
- blood fluke
- blood money
- blood pressure
- Blood River, Battle of
- blood serum
- blood transfusion
- blood typing
- blood vessel
- bloodfin
- bloodhound
- bloodroot
- bloodstone
- bloodworm
- Bloody Assizes
- bloody shirt
- Bloody Sunday
- Bloom, Claire
- Bloomer, Amelia Jenks
- bloomers
- Bloomfield
- Bloomfield Hills
- Bloomfield, Leonard
- Bloomfield, Robert
- Bloomgarden, Kermit
- Bloomington
- Bloomsburg
- Bloomsbury
- Bloomsbury group
- Blosius, Franciscus Ludovicus
- blot drawing
- Blount, Edward
- Blount, William
- Blountian orogeny
- blow fly
- blow molding
- Blow, John
- Blow, Susan Elizabeth
- blowgun
- blowpipe
- Bloy, Léon
- Blücher, Gebhard Leberecht von, PRINCE (Fürst) VON WAHLSTATT
- Bludenz
- Blue Book, The
- blue butterfly
- blue cheese
- blue crab
- blue jay
- blue law
- Blue Mountains
- Blue Nile River
- Blue Peter
- Blue Ridge
- Blue Ridge Parkway
- blue shark
- Blue Shirt
- blue vitriol
- blue whale
- blue-and-white ware
- blue-eyed grass
- blue-green algae
- blue-ribbon jury
- blueback
- Bluebeard
- bluebell
- blueberry
- bluebird
- bluebonnet
- bluecap
- Bluefield
- Bluefields
- bluefish
- bluegill
- bluegrass
- blueprint
- blues
- bluestem
- Bluestocking
- bluethroat
- Blum, Léon
- Blumberg, Baruch S(amuel)
- Blumenau
- Blumenbach, Johann Friedrich
- Blumenthal, Leonhard, Graf von
- Blunden, Edmund Charles
- blunderbuss
- Blunt, Anthony (Frederick)
- Blunt, Wilfrid Scawen
- Bluntschli, Johann Kaspar
- Bly, Nellie
- Blyth Valley
- Blytheville
- Blytt-Sernander system
- BND
- Bo
- Bo tree
- boa
- Boa Vista
- Boa Vista Island
- Boaco
- boar
- boarfish
- Boas, Franz
- Bob and Ray
- Bobadilla, Francisco de
- bobbin furniture
- bobbin lace
- Bobbio
- bobcat
- Bobo
- Bobo Dioulasso
- Boboli Gardens
- bobolink
- Bobrikov, Nikolay (Ivanovich)
- Bobruysk
- Bobrzynski, Michal
- bobsledding
- bobwhite
- Boca Raton
- bocage
- Bocage, Manuel Maria Barbosa du
- Boccaccio, Giovanni
- Boccalini, Traiano
- Boccanegra FAMILY
- Boccherini, Luigi
- Bocchus I
- Bocchus II
- boccie
- Boccioni, Umberto
- Bochart de Saron, Jean-Baptiste-Gaspard
- Bocher, Joan
- Bôcher, Maxime
- Bochner, Salomon
- Bocholt
- Bochum
- Bock, Fedor von
- Bock, Hieronymus (Tragus)
- Böcklin, Arnold
- Bocskay, István
- Bocuse, Paul
- Bodawpaya
- Bode's law
- Bode, Boyd H.
- Bode, Johann Elert
- Bode, Wilhelm von
- Bodel, Jehan
- Bodenheim, Maxwell
- Bodenstedt, Friedrich Martin von
- Bodh Gaya
- bodhi
- Bodhidharma
- bodhisattva
- Bodichon, Barbara Leigh Smith
- Bodin, Jean
- Bodleian Library
- Bodmer, Johann Georg
- Bodmer, Johann Jakob
- Bodmin
- Bodø
- Bodø Affair
- Bodoni, Giambattista
- Bodrum
- body building
- body heat
- body modifications and mutilations
- Boé
- Boece, Hector
- Boegoebergdam
- boehmite
- Boeing Company, The
- Boémond
- Boeotia
- Boeotian League
- Boer
- Boerhaave Museum
- Boerhaave, Hermann
- Boesak, Allan (Aubrey)
- Boesmanland
- Boethius, Anicius Manlius Severinus
- Boethusian
- Boeuf River
- Boffa
- Boffrand, (Gabriel-)Germain
- bog
- bog rosemary
- Bogalusa
- Bogan, Louise
- Boganda, Barthélemy
- Bogardus, James
- Bogart, Humphrey
- Bogazköy
- Bogdanovich, Peter
- Bognor Regis
- Bogomil
- Bogong, Mount
- Bogor
- Bogoraz, Vladimir Germanovich
- Bogotá
- Bogra
- Boguslawski, Wojciech
- Bohemia
- Bohemian Confession
- Bohemian Forest
- Bohemian glass
- Bohemian Massif
- Bohemian school
- Bohemian-Moravian Highlands
- Bohemond I
- Bohemond II
- Bohemond III
- Bohemond IV
- Bohemond V
- Bohemond VI
- Bohemond VII
- Böhm, Georg
- Böhm, Karl
- Böhm, Theobald
- Böhm-Bawerk, Eugen von
- Böhme, Jakob
- Böhmer, Johann Friedrich
- Bohol
- Bohol Sea
- Bohomolec, Franciszek
- Bohr atomic model
- Bohr, Aage N(iels)
- Bohr, Harald August
- Bohra
- Böhtlingk, Otto von
- Bohuslän
- Boian
- Boiardo, Matteo Maria, CONTE (count) DI SCANDIANO
- boid
- Boie, Heinrich Christian
- Boieldieu, François-Adrien
- Boii
- boil
- Boileau(-Despréaux), Nicolas
- boiler
- boiling
- boiling point
- Boilly, Louis-Léopold
- Boina
- Boise
- Boise National Forest
- Boise River
- Boise State University
- Boisguillebert, Pierre Le Pesant, sieur de
- Boismorter, Joseph Bodin de
- Boisrobert, François Le Metel, seigneur de
- Boito, Arrigo
- Bojador, Cape
- Bojer, Johan
- Bojo Guksa
- Bok, Bart J(an)
- Bok, Edward (William)
- Bokaro
- Bokassa, Eddine Ahmed
- Boké
- Bokenam, Osbern
- Bokhara rug
- Bokn Fjord
- Boksburg
- bokuseki
- bola
- Bolama
- Bolan Pass
- Bolangir
- Bolcom, William
- Bolden, Buddy
- Boldrewood, Rolf
- bolero
- Boleslav I
- Boleslav II
- Boleslav III
- Boleslaw I
- Boleslaw II
- Boleslaw III
- Boleslawski, Richard
- Boletaceae
- Bolgary
- Bolgatanga
- Bolger, James Brendan
- Bolingbroke, Henry Saint John, 1st Viscount, BARON SAINT JOHN OF LYDIARD TREGOZE
- Bolívar
- Bolívar, Cerro
- Bolívar, Simón
- Bolivia
- boll weevil
- Böll, Heinrich (Theodor)
- Bolland, Jean
- Bollandist
- Bollingen Prize
- bollworm
- Bologna
- Bologna stone
- Bologna, University of
- Bolognese school
- bolometer
- Bolovens, Plateau des
- Bolsena
- Bolshaya Sovetskaya Entsiklopediya
- Bolshevik
- Bolshoi Ballet
- Bolshoi Theatre
- bolson
- Bolsover
- bolt
- bolt action
- Bolt, Robert (Oxton)
- Bolton
- Bolton, Edmund
- Bolton, Guy (Reginald)
- Bolton, Herbert Eugene
- Boltwood, Bertram Borden
- Boltzmann constant
- Boltzmann, Ludwig Eduard
- Bolu
- bolus
- Bolyai, Farkas
- Bolyai, János
- Bolza, Oskar
- Bolzano
- Bolzano, Bernhard
- Boma
- bomb
- Bombacaceae
- bombard
- bombax cotton
- Bombay
- Bombay duck
- Bombay, University of
- bombazine
- bomber
- Bombycillidae
- Bomu River
- Bon
- Bon Marché
- Bon, Cape
- Bona Dea
- Bonacolsi FAMILY
- Bonaire
- Bonald, Louis-Gabriel-Ambroise, vicomte de
- Bonanza Creek
- Bonaparte FAMILY
- Bonaparte, (Marie-)Pauline
- Bonaparte, (Marie-Anne-)Élisa
- Bonaparte, (Marie-Annonciade-)Caroline
- Bonaparte, (Napoléon-Eugène-)Louis
- Bonaparte, Charles Joseph
- Bonaparte, Charles-Lucien, PRINCIPE (prince) DI CANINO E DI MUSIGNANO
- Bonaparte, Jérôme
- Bonaparte, Joseph
- Bonaparte, Louis
- Bonaparte, Louis-Lucien
- Bonaparte, Lucien
- Bonaparte, Napoléon-Joseph-Charles-Paul
- Bonaparte, Pierre-Napoléon
- Bonapartist
- Bonar, Horatius
- Bonard, Louis-Adolphe
- Bonaventure Island
- Bonaventure, SAINT
- Bonavista
- bond
- Bond, Julian
- Bond, Sir Robert
- Bond, William Cranch
- Bonde, Gustaf, Friherre
- Bondfield, Margaret (Grace)
- Bondi, Sir Hermann
- Bondoukou
- bone
- bone black
- bone china
- bone conduction
- bone cyst
- bone lesion
- bone marrow
- Bone, Henry
- Bone, Sir Muirhead
- bonefish
- Boner, Ulrich
- boneset
- Bonet, Juan Pablo
- Bonfils, Frederick Gilmer
- Bong Range
- Bongars, Jacques, SEIGNEUR (lord) DE BAULDRY ET DE LA CHESNAYE
- bongo
- bongo drum
- Bongor
- Bonham's Case
- bonheur du jour
- Bonheur, Rosa
- Bonhoeffer, Dietrich
- Bonhomme Richard and Serapis, engagement between
- Boniface I, SAINT
- Boniface II
- Boniface III
- Boniface IV, SAINT
- Boniface IX
- Boniface OF SAVOY
- Boniface V
- Boniface VI
- Boniface VII
- Boniface VIII
- Boniface, SAINT
- Bonifacio
- Bonifacio, Andres
- Bonin Islands
- Bonington, Richard Parkes
- bonito
- Bonivard, François
- Bonn
- Bonnard, Pierre
- Bonnat, Léon
- Bonner Durchmusterung
- Bonner, Edmund
- Bonnet Carre Spillway
- bonnet monkey
- bonnet shell
- Bonnet, Charles
- Bonnet, Georges-Étienne
- Bonneville Salt Flats
- Bonneville, Benjamin-Louis-Eulalie de
- Bonneville, Lake
- Bonny
- Bono
- bonobo
- Bonomi, Ivanoe
- Bononcini, Giovanni
- Bonporti, Francesco Antonio
- bonsai
- Bonstetten, Karl Viktor von
- Bontebok National Park
- Bontempelli, Massimo
- Bontemps, Arna (Wendell)
- Bonthe
- Bonus Army
- Bonvesin DA LA RIVA
- bony fish
- bony tongue
- booby
- boogie-woogie
- boojum tree
- book
- book club
- book collecting
- book lung
- book of hours
- Book of the Dead
- bookbinding
- bookcase
- bookkeeping
- bookmaking
- bookmobile
- bookplate
- bookworm
- Boole, George
- Boolean algebra
- boomerang
- boomslang
- Boone
- Boone, Daniel
- Boonesboro
- Boonville
- Boorde, Andrew
- Boorman, John
- Boorstin, Daniel J(oseph)
- Booth, Catherine
- Booth, Charles
- Booth, Edwin (Thomas)
- Booth, John Wilkes
- Booth, Maud Ballington
- Booth, Shirley
- Booth, William
- Booth, William Bramwell
- Boothbay Harbor
- Boothferry
- Boothia Peninsula
- bootlegging
- Bophuthatswana
- Bopolu
- Bopp, Franz
- Boppard
- Bor
- bora
- Bora-Bora
- boracite
- borage
- Boraginaceae
- Borah Peak
- Borah, William E.
- borane
- Borås
- borate mineral
- borax
- Borda, Jean-Charles de
- Bordaberry Arocena, Juan María
- Bordeaux
- Bordeaux I, II, and III, Universities of
- Bordeaux wine
- Borden
- Borden, Gail
- Borden, Lizzie (Andrew)
- Borden, Sir Frederick William
- Borden, Sir Robert (Laird)
- Bordentown
- border ballad
- border terrier
- Border, Allan Robert
- Borders
- Bordes, Charles
- Bordet, Jules
- Bordighera
- Bordone, Paris
- Bordoni, Faustina
- bore
- Boré, (Jean) Étienne
- Boreal Climatic Interval
- Boreas
- Borel, (Félix-Édouard-Justin-) Émile
- Borel, Jacques
- Borel, Petrus
- Borelli, Giovanni Alfonso
- Borenius, Tancred
- borer beetle
- Borg, Björn (Rune)
- Børge Mountains National Park
- Borgen, Johan (Collet Müller)
- Borger
- Borgerhout
- Borges, Jorge Luis
- Borghese FAMILY
- Borghese Gallery
- Borgia FAMILY
- Borgia, Cesare, DUC (duke) DE VALENTINOIS
- Borgia, Lucrezia
- Borgia, Saint Francis
- Borglum, (John) Gutzon (de la Mothe)
- Borgo Maggiore
- Borgongini-Duca, Francesco
- Borgu
- Borhyaenidae
- boric acid
- boride
- Borinage
- boring machine
- Boring, Edwin G.
- Boris I
- Boris III
- Borisoglebsk
- Borisov
- Borkou
- Borkou-Ennedi-Tibesti
- Borlänge
- Borlaug, Norman Ernest
- Borman, Frank
- Bormann, Martin
- Born, Max
- Borneo
- Bornholm
- bornite
- Borno
- Bornu
- Borobudur
- Borodin, Aleksandr (Porfiryevich)
- Borodin, Mikhail Markovich
- Borodino, Battle of
- boron
- boron group element
- Bororo
- Borotra, Jean
- borough
- borough-English
- Borovichi
- Borowski, Tadeusz
- Borromean Islands
- Borromeo, Saint Charles
- Borromini, Francesco
- Borrow, George (Henry)
- borsch
- Borsippa
- Borsod-Abaúj-Zemplén
- Borstal system
- bort
- Boruca
- Borujerd
- boryokudan
- Borzage, Frank
- borzoi
- Bosanquet, Bernard
- Boscán, Juan
- Boscawen, Edward
- Bosch (Gaviño), Juan
- Bosch GmbH
- Bosch, Carl
- Bosch, Hiëronymus
- Bosch, Johannes, graaf van den
- Bosch, Robert
- Bosco, Saint John
- Boscovich, Ruggero Giuseppe
- Bose, Satyendra Nath
- Bose, Sir Jagadis Chandra
- Bose, Subhas Chandra
- Bose-Einstein statistics
- Boselli, Paolo
- Bösendorfer, Ignaz
- Bosman, Herman Charles
- Bosna River
- Bosnia and Herzegovina
- Bosnian crisis of 1908
- Boso
- Boso Peninsula
- bosom bottle
- boson
- Bosporus
- Bosporus, Kingdom of the
- boss
- Boss, Lewis
- bossa nova
- Bosse, Abraham
- Bossert, Helmuth Theodor
- Bossuet, Jacques-Bénigne
- Boston
- Boston and Maine Railroad
- Boston Athenaeum
- Boston College
- Boston Globe, The
- Boston ivy
- Boston Latin School
- Boston Marathon
- Boston Massacre
- Boston Mountains
- Boston Police Strike
- Boston Tea Party
- Boston terrier
- Boston University
- Boston, Lucy
- Boston, Ralph
- Boston, Siege of
- Bostra
- Bosumtwi, Lake
- Boswell, James
- Bosworth Field, Battle of
- bot fly
- botanical garden
- botany
- Botany Bay
- Boteti River
- Botetourt, Norborne Berkeley, Lord
- Botev, Khristo
- Both, Jan
- Both, Pieter
- Botha, Louis
- Botha, P(ieter) W(illem)
- Bothe, Walther (Wilhelm Georg)
- Bothnia, Gulf of
- Bothriolepis
- Bothwell, Francis Stewart Hepburn, 5th earl of
- Bothwell, James Hepburn, 4th earl of, DUKE OF ORKNEY AND SHETLAND
- Botocudo
- Botosani
- botrytis blight
- Botsaris, Markos
- Botswana
- Botta, Carlo Giuseppe Guglielmo
- Botta, Paul-Émile
- Bottesini, Giovanni
- Botticelli, Sandro
- bottle
- bottle gourd
- bottle tree
- bottlenose whale
- bottom water
- bottomry
- Bottrop
- Botucatu
- botulism
- Botvinnik, Mikhail Moiseyevich
- Bou Saâda
- Bouaflé
- Bouaké
- Bouchardon, Edmé
- Boucher (de Crèvecoeur) de Perthes, Jacques
- Boucher, François
- Boucher, Jonathan
- Boucherville
- Bouches-du-Rhône
- Boucicault, Dion
- Boucicaut, Jean II le Meingre
- Boudiaf, Muhammad
- Boudicca
- Boudin, Eugène
- boudinage
- Boudinot, Elias
- Boudjedra, Rachid
- Boué, Ami
- Boufarik
- Boufflers, Louis-François, duc de
- Boufflers, Stanislas-Jean, chevalier de
- Bougainville Island
- Bougainville, Louis-Antoine de
- Bougainvillea
- Boughton, Rutland
- Bouguer, Pierre
- Bouguereau, William-Adolphe
- bouillabaisse
- Bouillaud, Jean-Baptiste
- Bouillon
- Bouira
- Boulainvilliers, Henri de, COMTE DE (count of) SAINT-SAIRE
- Boulanger, Georges (-Ernest-Jean-Marie)
- Boulanger, Nadia
- Boulder
- Boulder City
- boule
- Boule, Marcellin
- Boulemane
- boules
- boulevard
- Boulez, Pierre
- Boulle, André-Charles
- Boulle, Pierre (-François-Marie-Louis)
- Boullée, Étienne-Louis
- Boulogne
- Boulsover, Thomas
- Boult, Sir Adrian Cedric
- Boulter, Hugh
- Boulton, Matthew
- Boumedienne, Houari
- Bound Brook
- boundary layer
- Boundary Peak
- boundary value
- Boundiali
- Bountiful
- Bounty
- Bounty Islands
- Bounty System
- bouquet garni
- Bouraoui, Hédi (André)
- Bourassa, (Joseph-Napoléon) Henri
- Bourbaki, Charles-Denis-Sauter
- Bourbaki, Nicolas
- bourbon whiskey
- Bourbon, Charles I, 5{sup e} duc de
- Bourbon, Charles III, 8{sup e} duc de
- Bourbon, HOUSE OF
- Bourbon, Jean I, 4{sup e} duc de
- Bourbon, Jean II, 6{sup e} duc de
- Bourbon, Louis I, 1{sup er} duc de
- Bourbon, Louis II, 3{sup e} duc de
- Bourbon, Pierre I, 2{sup e} duc de
- Bourbon, Pierre II, 7{sup e} duc de
- Bourbonnais
- Bourboune, Mourad
- Bourchier, Thomas
- Bourdaloue, Louis
- Bourdelle, (Émile-) Antoine
- Bourdet, Édouard
- Bourdon, Sébastien
- Bourg
- Bourgault-Ducoudray, Louis
- Bourgeois, Léon(-Victor-Auguste)
- Bourgeois, Louis
- bourgeoisie
- Bourges
- Bourget, Paul (-Charles-Joseph)
- Bourguiba, Habib (ibn Ali)
- Bourignon, Antoinette
- Bourke
- Bourke-White, Margaret
- Bourmont, Louis-Auguste-Victor, Count (comte) de Ghaisnes de
- Bourne
- Bourne, Francis
- Bourne, Geoffrey (Howard)
- Bourne, Randolph Silliman
- Bournemouth
- bournonite
- Bournonville, August
- bourrée
- Bourrienne, Louis-Antoine Fauvelet de
- Boursault, Edme
- Bousoño, Carlos
- Boussac, Marcel
- Boussingault, Jean-Baptiste
- Boutens, Pieter Cornelis
- Bouterwek, Friedrich
- boutonneuse fever
- Boutros-Ghali, Boutros
- Bouts, Dirck
- bouts-rimés
- Boutwell, George Sewall
- Bouvard, Alexis
- bouvardia
- Bouvet Island
- Bouvier des Flandres
- Bouvines, Battle of
- bouzouki
- Boveri, Theodor Heinrich
- Bovet, Daniel
- bovid
- bovine infectious keratoconjunctivitis
- bow
- bow and arrow
- Bow porcelain
- Bow River
- bow wave
- Bow, Clara
- Bowdich, Thomas Edward
- Bowditch, Nathaniel
- Bowdler, Thomas
- Bowdoin College
- Bowdoin, James
- Bowell, Sir Mackenzie
- Bowen
- Bowen, Catherine (Shober)
- Bowen, Elizabeth (Dorothea Cole)
- Bowen, I(ra) S(prague)
- Bowen, John
- Bowen, Norman L(evi)
- Bowenia
- Bower, Frederick Orpen
- Bower, Walter
- Bowerbank, James Scott
- bowerbird
- Bowery, the
- Bowes, Edward
- bowfin
- Bowie, James
- Bowie, William
- Bowker, Richard Rogers
- Bowles, Chester (Bliss)
- Bowles, William Lisle
- bowling
- Bowling Green
- Bowling Green State University
- bowls
- Bowman, Isaiah
- Bowman, Sir William, 1ST BARONET
- Bowning orogeny
- Bowral
- Bowring Treaty
- Bowring, Sir John
- box elder
- box frame construction
- box lacrosse
- box set
- box turtle
- boxer
- Boxer Rebellion
- Boxer, Mark
- boxfish
- Boxhole Meteorite Crater
- boxing
- boxwood
- boxwork
- boy bishop
- Boy Scouts
- Boyacá
- Boyacá, Battle of
- boyar
- Boyce, William
- boycott
- Boycott, Charles Cunningham
- Boyd (of Kilmarnock), Robert Boyd, 1st Lord
- Boyd, Belle
- Boyd, Martin (à Beckett)
- Boyd, William
- Boyd-Orr of Brechin Mearns, John Boyd Orr, Baron
- Boye, Karin (Maria)
- Boyer, Charles
- Boyer, Jean-Pierre
- Boyington, Pappy
- Boyle's law
- Boyle, Kay
- Boyle, Robert
- Boylesve, René
- Boylston, Zabdiel
- Boyne, Battle of the
- Boyne, River
- Boyneburg, Johann Christian, Baron (Freiherr) von
- Boyoma Falls
- Boys Town
- Boys, Sir Charles Vernon
- boysenberry
- Bozeman
- Bozeman, John M.
- Braak, Menno ter
- Braaten, Oskar
- Brabant
- Brabham, Sir Jack
- Brac
- Bracciano, Lake
- brace and bit
- Brace, Charles Loring
- Bracegirdle, Anne
- brachial plexus
- brachiation
- brachiosaur
- brachistochrone
- bracken
- Brackenridge, Hugh Henry
- bracket
- bracket clock
- Brackley, Thomas Egerton, Viscount, BARON ELLESMERE
- Bracknell Forest
- braconid
- bracteate
- Bracton, Henry de
- Bradbury, Malcolm
- Bradbury, Ray (Douglas)
- Braddock, Edward
- Braddock, James J(oseph)
- Braddon, Mary Elizabeth
- Bradenton
- Bradford
- Bradford, Roark (Whitney Wickliffe)
- Bradford, William
- Bradford-on-Avon
- Bradlaugh, Charles
- Bradley, A(ndrew) C(ecil)
- Bradley, Bill
- Bradley, Edward Riley
- Bradley, F(rancis) H(erbert)
- Bradley, James
- Bradley, Joseph P.
- Bradley, Omar N(elson)
- Bradman, Don
- Bradshaw, John
- Bradshaw, Terry (Paxton)
- Bradstreet, Anne
- Bradwardine, Thomas
- Bradwell, Myra Colby
- Brady, James Buchanan
- Brady, Mathew B.
- Brady, Nicholas
- Brady, William A(loysius)
- bradycardia
- Bradysaurus
- Braemar
- Braga
- Braga, (Joaquim) Teófilo (Fernandes)
- Braga, Rubem
- Bragança
- Bragança, HOUSE OF
- Bragg law
- Bragg, Braxton
- Bragg, Don
- Bragg, Sir (William) Lawrence
- Bragg, Sir William (Henry)
- Brahe, Per, Greve (Count), THE YOUNGER
- Brahe, Tycho
- Brahm, Otto
- brahma
- brahma-loka
- brahmacharya
- Brahmagupta
- Brahman
- Brahmana
- Brahmani River
- Brahmanism
- Brahmapur
- Brahmaputra River
- Brahmarsi-desha
- brahmavihara
- Brahmi
- Brahmin
- Brahmo Samaj
- Brahms, Johannes
- Brahui
- Brahui language
- Braid movement
- Braid, James
- braiding
- Braila
- Braille
- Braille, Louis
- brain
- brain scanning
- Brain Trust
- Braine, John
- Brainerd
- Brainerd, David
- Braintree
- brainwashing
- braising
- Braithwaite, R.B.
- Braj Bhasa language
- brake
- Brakpan
- Bramah, Joseph
- Bramante, Donato
- Bramantino
- brambling
- Brampton
- Brampton Island
- bran
- branch and twig borer
- branchial arch
- branching
- branchiopod
- Branco River
- Branco, Cape
- Brancusi, Constantin
- Brand, Hennig
- Brand, John
- Brand, Sir Johannes Henricus
- Brand, Sir Quintin
- Brandeis University
- Brandeis, Louis (Dembitz)
- Brandenburg
- Brandenburg Gate
- Brandes, Edvard
- Brandes, Georg
- Brando, Marlon, (Jr.)
- Brandon
- Brandon Mountain
- Brandt, Alfred
- Brandt, Bill
- Brandt, Georg
- Brandt, Willy
- brandy
- Brandys, Kazimierz
- Brandywine Creek
- Brandywine, Battle of the
- Branford
- branle
- Branner, Hans Christian
- Bransfield, Edward
- Branson
- brant
- Brant, Joseph
- Brant, Sebastian
- Brantford
- Branting, Karl Hjalmar
- Brantôme, Pierre de
- Braque, Georges
- Bras d'Or Lake
- Brasidas
- Brasil, Banco do
- Brasília
- Brasov
- brass
- brass instrument
- Brassaï
- Brasseur de Bourbourg, Charles-Étienne
- Brasseur, Pierre
- Brassey, Thomas
- Brassicaceae
- Brasstown Bald
- Bratby, John Randall
- Brathwaite, Richard
- Bratianu, Constantin
- Bratianu, Ion (Constantin)
- Bratianu, Ionel
- Bratislava
- Bratsk
- Bratsk Dam
- Brattain, Walter H(ouser)
- Bratteli, Trygve (Martin)
- brattishing
- Brattle, Thomas
- Brattleboro
- Brauchitsch, (Heinrich Alfred) Walther von
- Braudel, (Paul Achille) Fernand
- Brauer, Richard Dagobert
- Braun, (Karl) Ferdinand
- Braun, Alexander Carl Heinrich
- Braun, Eva
- Braun, Lily
- Braun, Otto
- Braun, Wernher von
- Braunau
- Braunschweig
- Brava Island
- Bravais lattice
- Bravais, Auguste
- Bravo, Nicolás
- Bray
- Bray, Thomas
- Brazdzionis, Bernardas
- Brazil
- Brazil Current
- Brazil nut
- Brazilian Highlands
- brazilwood
- brazing
- Brazos River
- Brazosport
- Brazza, Pierre-Paul-François-Camille Savorgnan de
- Brazzaville
- Brea
- bread
- bread crumb sponge
- bread palm
- Breadalbane
- Breadalbane and Holland, John Campbell, 1st earl of
- breadfruit
- breadnut
- break
- breakfast cereal
- breakwater
- bream
- Bream, Julian Alexander
- breast cancer
- Breasted, James Henry
- breath analyzer
- breathing
- Brébeuf, Saint Jean de
- breccia
- Brechin
- Brecht, Arnold
- Brecht, Bertolt
- Breckinridge, John
- Breckinridge, John C(abell)
- Breckinridge, Sophonisba Preston
- Breckland
- Brecknock
- Brecon
- Brecon Beacons National Park
- Breda
- Breda, Treaty of
- Bredero, Gerbrand Adriaenszoon
- Brederode, Hendrik van
- breed association
- breeder reactor
- breeze
- Bregendahl, Marie
- Bregenz
- Bregenzerwald
- Bréguet, Abraham-Louis
- Bréguet, Louis-Charles
- Brehon laws
- Breisach
- Breisgau
- Breitenfeld, Battle of
- Breitinger, Johann Jakob
- Bremen
- Bremer Beiträger
- Bremer, Fredrika
- Bremerhaven
- Bremerton
- bremsstrahlung
- Bren machine gun
- Brendan, SAINT
- Brendel, Alfred
- Brennan, Christopher (John)
- Brennan, William J(oseph), Jr.
- Brenner Pass
- Brennus
- Brent
- Brent, Margaret
- Brentano, Clemens
- Brentano, Franz (Clemens)
- Brentano, Heinrich von
- Brentano, Lujo
- Brentwood
- Brenz, Johannes
- Bréquigny, Louis-Georges-Oudard-Feudrix de
- Brer Rabbit
- Brera, Pinacoteca di
- Brescia
- Bresdin, Rodolphe
- Bressanone
- Bresse
- Bresson, Robert
- Brest
- Brest-Litovsk, treaties of
- Brest-Litovsk, Union of
- Bret Hanover
- Brethren
- Brethren in Christ
- Bretislav I
- Bretón de los Herreros, Manuel
- Breton language
- Breton lay
- Breton literature
- Breton, André
- Breton, Nicholas
- Bretonneau, Pierre-Fidèle
- Bretscher, Willy
- Bretton Woods Conference
- bretwalda
- Breuer, Josef
- Breuer, Marcel (Lajos)
- Breuil, Henri-Édouard-Prosper
- brevet
- breviary
- Brewer, David J(osiah)
- Brewster chair
- Brewster's law
- Brewster, Kingman, Jr.
- Brewster, Sir David
- Brewster, William
- Breyer, Stephen
- Breytenbach, Breyten
- Brézé, Pierre II de
- Brezhnev, Leonid Ilich
- Brezina, Otakar
- Brhaspati
- Brialmont, Henri-Alexis
- Brian
- Brian, Havergal
- Brianchon, Charles-Julien
- Briançon
- Briand, Aristide
- briard
- Briareus
- bribery
- Bribie Island
- Brice, Fanny
- brick
- Bricker, John W.
- Briçonnet, Guillaume
- Bricriu's Feast
- Bridalveil Fall
- Bridel, Philippe-Sirice
- bridewealth
- bridge
- bridge whist
- Bridge, Frank
- Bridgend
- Bridgeport
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- brine
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- Brisbane
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- brisé
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- Bristol
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- brittle mica
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- broadside ballad
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- Broca, Paul
- Broca, Philippe de
- brocade
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- brochantite
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- Brockdorff-Rantzau, Ulrich, Count (Graf) von
- Brocken
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- brocket
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- broderie
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- Brodsky, Joseph
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- 'Brog-mi
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- Broglie, (Achille-Charles-Léonce-) Victor, 3{sup e} duc de (3rd duke of)
- Broglie, (Jacques-Victor-) Albert, 4{sup e} duc de
- Broglie, (Louis-César-Victor-) Maurice, 6{sup e }duc de
- Broglie, François-Marie, 1st Duke (1{sup er} Duc) de
- Broglie, Louis-Victor (-Pierre-Raymond), 7{sup e} duc de
- Broglie, Victor-François, 2nd Duke (2 Duc) de
- broiling
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