ˈnākə(r) noun
( -s )
Etymology: Middle French, from Old Italian naccara, nacchera nacre, drum, from Arabic naqqārah drum
1. archaic : a shellfish that yields mother-of-pearl
2. : the iridescent inner layer of various mollusk shells consisting chiefly of calcium carbonate deposited in thin overlapping sheets with some organic matter (as conchiolin) : mother-of-pearl