Definition of onyx in English:

onyx

Syllabification: on·yx
Pronunciation: /ˈäniks
 
/

noun

  • A semiprecious variety of agate with different colors in layers.
    More example sentences
    • 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'.

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