onyx[adjective]Synonyms: black, atramentous, ebony, inky, jet, jetty, pitch-black, pitch-dark, raven, sable
 [TahlilGaran] English Synonym Dictionary ▲
 on‧yx /ˈɒnɪks $ ˈɑː-/ 
 noun [uncountable][
Date: 1200-1300; 
Language: Old French; 
Origin: Latin, from Greek, 'claw, nail']
 a stone with lines of different colours in it, often used in jewellery 
 [TahlilGaran] Dictionary of Contemporary English ▲