Nouns starting with O that are validated

• output-to-input ratio — Noun – English ～ the output power of a transducer divided by the input power
• obstetrical toad — Noun – English ～ European toad whose male carries the fertilized eggs wrapped around its hind legs until they hatch
• old-field toadflax — Noun – English ～ North American plant having racemes of blue-violet flowers
• orange toast — Noun – English ～ buttered toast with sugar and grated orange rind and a little orange juice
• oxyacetylene torch — Noun – English ～ a blowtorch that burns oxyacetylene
• order Torpediniformes — Noun – English ～ rays with bodies shaped like torpedoes
• om torsdagen — Noun – Danish ～ en bestemt torsdag
• om torsdagen — Noun – Danish ～ hver torsdag
• orange tortrix — Noun – English ～ California moth whose larvae live in especially oranges
• on tour — Noun – English ～ travelling about; "they took the show on the road"; "they lost all their games on the road"
• observation tower — Noun – English ～ a structure commanding a wide view of its surroundings
• optic tract — Noun – English ～ the cranial nerve that serves the retina
• organ transplant — Noun – English ～ an operation moving an organ from one organism (the donor) to another (the recipient); "he had a kidney transplant"; "the long-term results of cardiac transplantation are now excellent"; "a child had a multiple organ transplant two months ago"
• offentlig/kollektiv transport — Noun – Danish ～ den transport el. de transportmidler som udbydes k ...
• os trapezium — Noun – English ～ the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
• os trapezoideum — Noun – English ～ the wrist bone between the trapezium and the capitate bones
• out-tray — Noun – English ～ a wood or metal receptacle placed on your desk to hold your outgoing material
• orthodontic treatment — Noun – English ～ dental treatment that corrects irregularities of the teeth or of the relation of the teeth to surrounding anatomy; treatment is usually by braces or mechanical aids; "orthodontic treatment of facial abnormalities"
• oak tree — Noun – English ～ a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns"
• ordeal tree — Noun – English ～ evergreen shrub or tree of South Africa

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