Nouns starting with O that are validated

• orange tree — Noun – English ～ any citrus tree bearing oranges
• orchid tree — Noun – English ～ small East Indian tree having orchid-like flowers and hard dark wood
• orchard apple tree — Noun – English ～ native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits
• olive-tree agaric — Noun – English ～ red luminescent mushroom of Europe
• olive tree — Noun – English ～ a tree of the genus Olea cultivated for its fruit
• order Tremellales — Noun – English ～ fungi varying from gelatinous to waxy or even horny in texture; most are saprophytic
• oblique triangle — Noun – English ～ a triangle that contains no right angle
• obtuse-angled triangle — Noun – English ～ a triangle that contains an obtuse interior angle
• obtuse triangle — Noun – English ～ a triangle that contains an obtuse interior angle
• order Trichoptera — Noun – English ～ an order of insects consisting of caddis flies
• one-trillionth — Noun – English ～ one part in a trillion equal parts
• ocean trip — Noun – English ～ an act of traveling by water
• os triquetrum — Noun – English ～ a wrist bone that articulates with the pisiform and hamate and lunate bones
• order Trogoniformes — Noun – English ～ trogons
• 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

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