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• Om
• Omagh
•
Omaha, indigenous people of North America
• Omaha, city, United
States
• O'Mahony,
John
• O'Malley,
Frank Ward
• Oman,
Sir Charles William Chadwick
• Oman
• Omar, caliph
• Omar, in the Bible
• Omar Khayyam
• Ombos
•
ombu
• ombudsman
• Omdurman
•
O'Meara, Barry Edward
•
Omei
• omen
• Omicron Ceti
• omnibus
•
omnivore
•
Omphale
• omphalos
• Omri
•
Omsk
• Omuta
• On
•
Ona, Pedro de
•
onager
• Onan
• Onassis, Aristotle
Socrates
• Onassis,
Jacqueline Bouvier
• Onate,
Juan de
• Oncken,
Hermann
• Oncken,
Wilhelm
• Ondaatje,
Michael
• Ondo
• O'Neal, Shaquille
• Onega
•
Onega, Lake
•
Oneida, indigenous people of North
America
• Oneida,
city, United States
• Oneida
Lake
• O'Neill,
Eugene (Gladstone)
• O'Neill,
Hugh
• O'Neill,
Margaret
• O'Neill,
Owen Roe
• O'Neill,
Paul Henry
• O'Neill,
Shane
• O'Neill,
Tip
• O'Neill
of the Maine, Terence Marne O'Neill, Baron
• Oneonta
• Onesimus
•
Onesiphorus
•
Ongania, Juan Carlos
•
onion
• Onions,
C. T.
• Onitsha
• Onkelos
•
Onnes, Heike Kamerlingh
•
Ono
• onomatopoeia
• Onomichi
•
Onondaga
• Onondaga
Lake
• Ono no
Komachi
• Onslow,
George
• Ontario,
province, Canada
• Ontario,
city, United States
• Ontario,
Lake
• ontogeny
• ontology
• O Nuallaian,
Brian
• Onychophora
• onyx
•
oolite
• Oomycota
• Oort, Jan Hendrik
• Oort cloud
• Oost, Jacob van
• Oostende
•
Ootacamund
•
OPA
• opal
• Opalinida
•
Opa-Locka
• op
art
• Opava
• OPEC
•
Opelika
• Opelousas
• open-chain compound
• open cluster
• Open Door
•
open education
•
open-end investment company
•
open enrollment
•
open-hearth process
•
open shop
•
Open University
•
Opera
• opera
• opera glass
• operational amplifier
• operetta
•
operon
• Ophel
• Ophelia
• ophicleide
• Ophion
•
Ophir
• Ophites
• Ophrah
•
ophthalmia neonatorum
•
ophthalmology
•
ophthalmoscope
•
Ophuls, Marcel
•
Ophuls, Max
•
opiate drug
•
Opie, John
•
Opitz, Martin
•
opium
• Opium
Wars
• Opobo
• Opole
•
Oporto
• opossum
• Oppeln
•
Oppenheimer, J. Robert
•
Opper, Frederick Burr
•
Oppian
• Oppland
• Opportunity
• opportunity school
• opposition
• Ops
•
optative
•
optical activity
•
optical character recognition
•
optical density
•
optical disk
•
optical double
•
optical rotation
•
optical sensing
•
optician
• optic
nerve
• optics
• optometry
•
opus
• Opus
Dei
• oracle
• oracle bones
• Oradea
•
Oraefajokull
•
Oraibi
• Oral
• oral history
• Oran
•
Orange, town, France
•
Orange, cities, United States
•
orange, in botany
•
Orangeburg
•
Orange Free State
•
Orangemen
• Orange
River
• orangutan
• Oranienbaum
• Oranienburg
• Oranjestad
• oratorio
•
oratory
• Oratory,
Congregation of the
• orbit
• Orbiting Astronomical
Observatory
• Orbiting
Geophysical Observatory
• Orbiting
Solar Observatory
• Orcagna
• orchard
•
orchard grass
•
orchestra and orchestration
•
orchid
• orchil
• Orchomenus
• Ord, Edward Otho
Cresap
• ordeal
• order
•
Ordericus Vitalis
•
Order of American Knights
•
orders, holy
•
orders in council
•
orders of architecture
•
Ordinance of 1787
•
ordinate
•
ordination
•
Ordos
• Ordovician
period
• Ordu
• Ordzhonikidze
• ore
•
oread
• Oreb
• Orebro
•
oregano
• Oregon,
state, United States
• Oregon,
city, United States
• Oregon,
University of
• Oregon
Caves National Monument
• Oregon
grape
• Oregon
State University
• Oregon
Trail
• Orekhovo-Zuyevo
• Orel
•
Orellana, Francisco de
•
Orem
• Ore
Mountains
• Orenburg
• Orense
•
Oreopithecus
•
Oreor
• Orestes,
Roman general
• Orestes,
in Greek mythology
• Orestia
• Oresund
•
Orff, Carl
•
Orford, Robert Walpole, 1st earl of
• organ
•
organic chemistry
•
organic farming
•
organic food
•
Organization for Economic Cooperation and
Development
• Organization
for Security and Cooperation in Europe
• Organization
of African Unity
• Organization
of American States
• Organization
of Petroleum Exporting Countries
• organized
crime
• organometallic
chemistry
• Organ
Pipe Cactus National Monument
• organ
transplant
• organum
• Orhan
The Columbia Electronic Encyclopedia Copyright © 2009, Columbia
University Press.
Licensed from Columbia University Press. All rights reserved.
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