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onyx

[on-iks, oh-niks]
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noun
  1. Mineralogy. a variety of chalcedony having straight parallel bands of alternating colors.Compare Mexican onyx.
  2. (not used technically) an unbanded chalcedony dyed for ornamental purposes.
  3. black, especially a pure or jet black.
  4. Medicine/Medical. a nail of a finger or toe.
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adjective
  1. black, especially jet black.
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Origin of onyx

1250–1300; Middle English onix < Latin onyx < Greek ónyx nail, claw, veined gem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for onyx

onyx

noun
  1. a variety of chalcedony with alternating black and white parallel bands, used as a gemstone. Formula: SiO 2
  2. a compact variety of calcite used as an ornamental stone; onyx marble. Formula: CaCO 3
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Word Origin

C13: from Latin from Greek: fingernail (so called from its veined appearance)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for onyx

n.

mid-13c., from Old French oniche "onyx" (12c.), and directly from Latin onyx (genitive onychis), from Greek onyx "onyx-stone," originally "claw, fingernail" (see nail (n.)). So called because the mineral's color sometimes resembles that of a fingernail, pink with white streaks.

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Online Etymology Dictionary, © 2010 Douglas Harper

onyx in Medicine

onyx

(ŏnĭks)
onyx in Science

onyx

[ŏnĭks]