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Title Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9

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Orion Nebula (in astronomy)
Orissa (state, India)
Orkney Islands (former region, island group, Scotland)
Orlando (city, Florida)
Orlando, Vittorio Emanuele (Italian statesman/stateswoman & jurist)
Orlans (Europe)
Orlans, house of (Modern Europe)
Orlans, Louis-Philippe-Joseph, duke d' (French politician & military leader)
Ormandy, Eugene (American conductor)
ormolu (in metallurgy)
Ormonde, James Butler, 12th earl and 1st duke of (Irish statesman/stateswoman & politician)
Orne River (river)
Oromo (people, Ethiopia/Kenya)
Orontes River (river, Lebanon)
Orozco, Jos Clemente (Mexican painter & graphic artist)
Orpheus (in Greek Mythology)
Orphism (movement)
Orr, Bobby (Canadian hockey player)
Ortega (Saavedra), (Jos) Daniel (Political Leader / President of Nicaragua)
Ortega y Gasset, Jos (Spanish writer & philosopher)
Orthodox Judaism (branch of Judaism)
orthopedics (branch of medicine)
Orton, Joe (English dramatist)
oryx (mammal)
Osage (indigenous people of North America)
Osage River (river, United States)
Osborne, John (James) (English dramatist)
Osceola (American native American leader & chief)
oscillator (electronics)
Oshogbo (city, Nigeria)
Osiris (ancient religion, ancient Egypt)
Osler, Sir William (Canadian physician)
Oslo (city, Norway)
osmium (Chemistry)
osmosis (process)
osprey (bird)
Osrone (Middle East)