Words in english starting with O

• order Rickettsiales — Noun – English ～ pleomorphic Gram-negative microorganisms
• olive ridley — Noun – English ～ olive-colored sea turtle of tropical Pacific and Indian and the southern Atlantic oceans
• oil rig — Noun – English ～ rig used in drilling for oil or gas
• offshore rig — Noun – English ～ drilling rig consisting of an offshore platform (floating or fixed to the sea bed) from which many oil wells can be bored radially
• oil rigger — Noun – English ～ someone who works on an oil rig
• ottava rima — Noun – English ～ a stanza of eight lines of heroic verse with the rhyme scheme abababcc
• orange rind — Noun – English ～ the rind of an orange
• O ring — Noun – English ～ a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure
• Ob River — Noun – English ～ a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea
• Orinoco River — Noun – English ～ a South American river 1,500 miles long; flows into the South Atlantic
• Orange River — Noun – English ～ a river in South Africa that flows generally westward to the Atlantic Ocean
• Ottawa river — Noun – English ～ a river in southeastern Canada that flows along the boundary between Quebec and Ontario to the Saint Lawrence River near Montreal
• Ouachita River — Noun – English ～ a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River
• Ouse River — Noun – English ～ a river in northeastern England that flows generally southeastward to join the Trent River and form the Humber
• Osage River — Noun – English ～ a river in Missouri that is a tributary of the Missouri River
• Ohio River — Noun – English ～ a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River
• Oder River — Noun – English ～ a European river; flows into the Baltic Sea
• oriental roach — Noun – English ～ dark brown cockroach originally from orient now nearly cosmopolitan in distribution
• off-roader — Noun – English ～ a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
• Otto Robert Frisch — Noun – English ～ British physicist (born in Austria) who with Lise Meitner recognized that Otto Hahn had produced a new kind of nuclear reaction which they named nuclear fission; Frisch described the explosive potential of a chain nuclear reaction (1904-1979)

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