onyx: [13] Greek ónux meant ‘claw, fingernail’ (it is distantly related to English nail). Certain sorts of onyx are pink with white streaks, and a resemblance to pink fingernails with their paler crescent-shaped mark at the base led the Greeks to name the stone ónux. The word travelled to English via Latin onyx and Old French onix. => nail[onyx etymology, onyx origin, 英语词源]