onyx - WordReference.com Dictionary of English

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onyx

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Concise Oxford English Dictionary © 2008 Oxford University Press:
onyx /ˈɒnɪks, ˈəʊnɪks/

▶noun a semi-precious variety of agate with different colours in layers.

– origin ME: from OFr. oniche, onix, via L. from Gk onux ‘fingernail or onyx’.

'onyx' also found in these Oxford entries:

chalcedony - onyx marble - sardonyx

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