The Collaborative International Dictionary
Onychia
Onychia \O*nych"i*a\, n. [NL. See Onyx.] (Med.)
A whitlow.
An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.
Wiktionary
onychia
n. 1 A whitlow. 2 An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.