Nouns starting with O

• Oncorhynchus tshawytscha — Noun – English ～ large Pacific salmon valued as food; adults die after spawning
• order Tuberales — Noun – English ～ small order of fungi belonging to the subdivision Ascomycota having closed underground ascocarps
• Oxalis tuberosa — Noun – English ～ South American wood sorrel cultivated for its edible tubers
• order Tubulidentata — Noun – English ～ an order of Eutheria
• order Tulostomatales — Noun – English ～ an order of fungi belonging to the class Gasteromycetes
• Opuntia tuna — Noun – English ～ tropical American prickly pear of Jamaica
• Ottoman Turk — Noun – English ～ a Turk (especially a Turk who is a member of the tribe of Osman I)
• ocellated turkey — Noun – English ～ wild turkey of Central America and northern South America
• oil of turpentine — Noun – English ～ volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally
• one-twelfth — Noun – English ～ one part in twelve equal parts
• oil tycoon — Noun – English ～ a powerful person in the oil business
• order Ulvales — Noun – English ～ an order of protoctist
• order Umbellales — Noun – English ～ plants having umbels or corymbs of uniovulate flowers; includes the Umbelliferae (chiefly herbs) and Cornaceae (chiefly trees or shrubs)
• Ornithogalum umbellatum — Noun – English ～ common Old World herb having grasslike leaves and clusters of star-shaped white flowers with green stripes; naturalized in the eastern United States
• Osco-Umbrian — Noun – English ～ a group of dead languages of ancient Italy; they were displace by Latin
• odd-toed ungulate — Noun – English ～ placental mammals having hooves with an odd number of toes on each foot
• olive-drab uniform — Noun – English ～ military uniform of the United States Army; made from cloth of a dull olive color
• Omani monetary unit — Noun – English ～ monetary unit in Oman
• Open University — Noun – English ～ a British university that is open to people without formal academic qualifications and where teaching is by correspondence or broadcasting or summer school
• Ohio State University — Noun – English ～ a university in Columbus, Ohio

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