Webster’s Revised Unabridged Dictionary · 1913
Onychia
O·nych′i·a (ō·nĭk′ĭ·ȧ), n. [NL. See Onyx.] (Med.) (a) A whitlow. (b) An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.