- onyxA banded variety of chalcedony, a cryptocrystalline form of quartz.
- endonyxRelated to the deeper layers of nails.
- leuconychiaWhite discoloration of the nails.
- onycho-Nail: Relating to fingernails, toenails, or homologous structures such as claws or hooves.
- onychotillomaniaA compulsion for picking and tearing at one's fingernails or toenails.