onyx
/ˈɒnɪks
/ /ˈəʊnɪks /noun [mass noun]
A semi-precious variety of agate with different colours in layers: [as modifier]: an onyx ashtray...
- I should stock up one jade, rubies, onyx, malachite, and diamonds.
- Most of them were common gems - rubies, diamonds, onyxes, sapphires, emeralds, topazes, and so on, and were used to supplement Elements and Talents.
- Onyx, especially black onyx is said to help overcome hearing problems and to promote concentration and self-control.
Origin
Middle English: from Old French oniche, onix, via Latin from Greek onux 'fingernail or onyx'.