Dictionary  on•yxPronunciation: (on'iks, ō'niks), [key] —n. 1. Mineral.a variety of chalcedony having straight parallel bands of alternating colors. Cf. Mexican onyx. 2. (not used technically) an unbanded chalcedony dyed for ornamental purposes. 3. black, esp. a pure or jet black. 4. Med.a nail of a finger or toe. —adj. black, esp. jet black. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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