[on-i-koh-fey-juh, -jee-uh]
noun Psychiatry.
the practice of biting one's nails, especially when done habitually and as a symptom of emotional disturbance.

1895–1900; < Greek onycho- (combining form of ónyx nail, claw; see onyx) + -phagia

onychophagist [on-uh-kof-uh-jist] , noun
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