| Word | Definitions | Synonyms |
|---|---|---|
| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
| 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 |
| onychosis | (noun) any disease or disorder of the nails | - |