onychotillomania
noun
on·y·cho·til·lo·ma·nia
| \ ˌän-i-kə-ˌtil-ə-ˈmā-nē-ə, -nyə
\
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Medical Definition of onychotillomania
: an obsessive-compulsive disorder marked by the picking at or pulling out of one's fingernails or toenails