Definition of "onyx" in English

noun

1. (mineralogy) A banded variety of chalcedony, a cryptocrystalline form of quartz.

2. A jet-black color, named after the gemstone.

3. Any of various lycaenid butterflies of the genus Horaga.

adjective

1. jet-black

   • And the gold of that land is good: there is bdellium and the onyx stone.