Words starting with O

• oxygen-trapping – not validated
• ol-trav – not validated
• ober-trave – not validated
• oft-traveling – not validated
• 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"
• over-treatment – not validated
• 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
• 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
• olive-trees – not validated
• order Tremellales — Noun – English ～ fungi varying from gelatinous to waxy or even horny in texture; most are saprophytic
• on-trend – not validated
• on trial — Adjective – English ～ in the process of being tested or tried
• ol-trialet – not validated
• oblique triangle — Noun – English ～ a triangle that contains no right angle

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