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The Collaborative International Dictionary
Onychia

Onychia \O*nych"i*a\, n. [NL. See Onyx.] (Med.)

  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.

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.