1) Onychitis 
[moth] Onychia is a genus of moth in the family Geometridae. It is considered a synonym of Scotopteryx. ...
• (n.) An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail. • (n.) A whitlow.
(o-nik´e-ә) inflammation of the nail bed, resulting in loss of the nail.
O·nych'i·a noun [ New Latin See Onyx .] (Medicine) (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. 
Type: Term Pronunciation: ō-nik′ē-ă Definitions: 1. Inflammation of the matrix of the nail.