| Word | Definitions | Synonyms |
|---|---|---|
| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
| sardonyx | (noun) an onyx characterized by parallel layers of sard and a different colored mineral | - |