Definition of onyx noun from the Oxford Advanced Learner's Dictionary

 

onyx

 noun
noun
BrE BrE//ˈɒnɪks//
 
; NAmE NAmE//ˈɑːnɪks//
 
[uncountable]
 
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a type of stone that has layers of different colours in it, usually used for decorative objects Word Origin Middle English: from Old French oniche, onix, via Latin from Greek onux ‘fingernail or onyx’.
See the Oxford Advanced American Dictionary entry: onyx