Nouns starting with O

• Onobrychis viciifolia — Noun – English ～ Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain
• Ovis vignei — Noun – English ～ bearded reddish sheep of southern Asia
• Oxalis violacea — Noun – English ～ perennial herb of eastern North America with palmately compound leaves and usually rose-purple flowers
• Ostrya virginiana — Noun – English ～ medium-sized hop hornbeam of eastern North America
• Odocoileus Virginianus — Noun – English ～ common North American deer; tail has a white underside
• oil of vitriol — Noun – English ～ (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry
• on the qui vive — Noun – English ～ lively attentiveness
• OB-vogn — Noun – Danish ～ større bil udstyret til brug for radio- og tv-opta ...
• order Volvocales — Noun – English ～ chiefly freshwater green algae; solitary or colonial
• Otto von Bismarck — Noun – English ～ German statesman under whose leadership Germany was united (1815-1898)
• Origanum vulgare — Noun – English ～ aromatic Eurasian perennial
• Otto Wagner — Noun – English ～ Austrian architect and pioneer of modern architecture (1841-1918)
• Otto Heinrich Warburg — Noun – English ～ German biochemist who pioneered the use of chemical techniques in biological investigations; noted for studies of cellular respiration (1883-1970)
• oil-water interface — Noun – English ～ an interface forming the boundary between the non-miscible liquids oil and water
• Okeechobee Waterway — Noun – English ～ a waterway used by small boats to travel between the Atlantic Ocean and the Gulf of Mexico through Lake Okeechobee and the Caloosahatchee Canal and the Caloosahatchee River
• one-way street — Noun – English ～ unilateral interaction; "cooperation cannot be a one-way street"
• one-way light time — Noun – English ～ the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object
• one-way street — Noun – English ～ a street on which vehicular traffic is allowed to move in only one direction
• Organization for the Prohibition of Chemical Weapons — Noun – English ～ international organization for chemical disarmament; administers the Chemical Weapons Convention
• open weave — Noun – English ～ a weave in which warp threads never come together, leaving interstices in the fabric

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