Meaning of “onyx” in the English Dictionary

british dictionary

"onyx" in British English

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onyxnoun [ U ]

uk /ˈɒn.ɪks/ us /ˈɑː.nɪks/

a valuable stone that is used in jewellery, with white, black, grey, and other coloured stripes

(Definition of “onyx” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)