| oracular | (adjective) of or relating to an oracle | - |
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| (adjective) resembling an oracle in obscurity of thought | Synonyms: enigmatic |
| (adjective) obscurely prophetic | Synonyms: Delphic |
| oral | (adjective) of or involving the mouth or mouth region or the surface on which the mouth is located | Synonyms: buccal |
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| (adjective) a stage in psychosexual development when the child's interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression | - |
| (adjective) of or relating to or affecting or for use in the mouth | - |
| (adjective) using speech rather than writing | Synonyms: unwritten |
| orange | (adjective) of the color between red and yellow; similar to the color of a ripe orange | Synonyms: orangish |
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| orangish | (adjective) of the color between red and yellow; similar to the color of a ripe orange | Synonyms: orange |
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| oratorical | (adjective) characteristic of an orator or oratory | - |
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