onychopathology

on·y·cho·pa·thol·o·gy

(on'i-kō-pă-thol'ŏ-jē), Study of diseases of the nails.

onychopathology

A term variously defied as:
(1) Any disease of the nails; 
(2) The formal study of diseases of the nails; onychology.
While this term fills a lexical void, it is not commonly used in the working medical parlance.

onychopathology

(ŏn″ĭ-kō-pă-thŏl′ō-jē) [″ + pathos, disease, suffering, + logos, word, reason] The study of diseases of the nails.