onyx

/ˈɒnɪks/

noun

  1. 1

    A banded variety of chalcedony, a cryptocrystalline form of quartz.

  2. 2

    A jet-black color, named after the gemstone.

  3. 3

    Any of various lycaenid butterflies of the genus Horaga.

adjective

  1. 1

    Jet-black

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