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English definition of “onyx”

onyx

noun [U]     /ˈɒn.ɪks/ US  /ˈɑː.nɪks/
a valuable stone with white and grey stripes that is used in jewellery Precious and semi-precious stonesTypes of rock
(Definition of onyx noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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