| oscillating | (adjective) having periodic vibrations | Synonyms: oscillatory |
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| oscillatory | (adjective) having periodic vibrations | Synonyms: oscillating |
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| oscine | (adjective) of or relating to the songbirds | - |
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| oscitant | (adjective) showing lack of attention or boredom | Synonyms: drowsy, yawning |
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| osmotic | (adjective) of or relating to osmosis | - |
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| osseous | (adjective) composed of or containing bone | Synonyms: bony, osteal |
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| ossicular | (adjective) pertaining to the ossicles in the middle ear | Synonyms: ossiculate |
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| ossiculate | (adjective) pertaining to the ossicles in the middle ear | Synonyms: ossicular |
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| ossiferous | (adjective) containing bones (especially fossil bones) | - |
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| ossified | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilised, fossilized |
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| osteal | (adjective) composed of or containing bone | Synonyms: bony, osseous |
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| (adjective) relating to bone or to the skeleton | - |
| ostensible | (adjective) represented or appearing as such; pretended | Synonyms: ostensive |
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| (adjective) appearing as such but not necessarily so | Synonyms: apparent, seeming |
| ostensive | (adjective) represented or appearing as such; pretended | Synonyms: ostensible |
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| (adjective) manifestly demonstrative | - |
| ostentatious | (adjective) intended to attract notice and impress others | Synonyms: pretentious |
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| (adjective) (of a display) tawdry or vulgar | Synonyms: pretentious |