Ŏn'y-chȧ, n.

(ŏn'ĭ-kȧ), n. [Lat. onyx, onychis, Gr. ὄνυξ, ὄνυχος, a claw, a finger-nail, a yellowish precious stone, a veined gem, a muscle of the scallop species.] 1. The shell of a species of muscle, found in the lakes of India, which, when burned, emits a musky odor. 2. The precious stone called onyx.