| orach | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orache |
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| orache | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orach |
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| oracle | (noun) a shrine where an oracular god is consulted | - |
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| (noun) a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible | - |
| (noun) an authoritative person who divines the future | Synonyms: prophesier, prophet, seer, vaticinator |
| oral | (noun) an examination conducted by spoken communication | Synonyms: oral exam, oral examination, viva, viva voce |
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| orang | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orangutan, orangutang, Pongo pygmaeus |
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| orange | (noun) orange color or pigment; any of a range of colors between red and yellow | Synonyms: orangeness |
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| (noun) round yellow to orange fruit of any of several citrus trees | - |
| (noun) any citrus tree bearing oranges | Synonyms: orange tree |
| (noun) any pigment producing the orange color | - |
| orangeade | (noun) sweetened beverage of diluted orange juice | - |
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| orangeness | (noun) orange color or pigment; any of a range of colors between red and yellow | Synonyms: orange |
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| orangery | (noun) a place where oranges are grown; a plantation of orange trees in warm climes or a greenhouse in cooler areas | - |
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| orangewood | (noun) fine-grained wood of an orange tree; used in fine woodwork | - |
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| orangutan | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orang, orangutang, Pongo pygmaeus |
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| orangutang | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orang, orangutan, Pongo pygmaeus |
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| oration | (noun) an instance of oratory | - |
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| orator | (noun) a person who delivers a speech or oration | Synonyms: public speaker, rhetorician, speechifier, speechmaker |
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| oratorio | (noun) a musical composition for voices and orchestra based on a religious text | Synonyms: cantata |
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| oratory | (noun) addressing an audience formally (usually a long and rhetorical address and often pompous) | - |
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