ONYX Meaning of ONYX in English [ 'ɒnɪks , 'əʊnɪks ]■ noun a semi-precious variety of agate with different colours in layers.OriginME: from OFr. oniche , onix , via L. from Gk onux 'fingernail or ~'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004