onychopathology
on·y·cho·pa·thol·o·gy
(on'i-kō-pă-thol'ŏ-jē),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.