| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
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| onychophoran | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: peripatus, velvet worm |
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| onychosis | (noun) any disease or disorder of the nails | - |
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| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
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| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
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