Words starting with O that are validated

• 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)
• off-the-wall — Adjective – English ～ conspicuously or grossly unconventional or unusual; "restaurants of bizarre design--one like a hat, another like a rabbit"; "famed for his eccentric spelling"; "a freakish combination of styles"; "his off-the-wall antics"; "the outlandish clothes of teenagers"; "outre and affected stage antics"
• 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
• out of the way — Adjective – English ～ improper or even offensive; "out-of-the-way remarks"
• out of the way — Adjective – English ～ remote from populous or much-traveled regions; "they found a quiet out-of-the-way resort"
• out of the way — Adjective – English ～ exceptional, unusual, or remarkable; "out-of-the-way information"
• out-of-the-way — Adjective – English ～ improper or even offensive; "out-of-the-way remarks"
• out-of-the-way — Adjective – English ～ remote from populous or much-traveled regions; "they found a quiet out-of-the-way resort"
• out-of-the-way — Adjective – English ～ exceptional, unusual, or remarkable; "out-of-the-way information"
• out of the way — Adjective – English ～ dealt with; disposed of; "I'm so relieved that my midterm is out of the way"

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