— onychophagist /on'euh kof"euh jist/ , n.
/on'i koh fay"jeuh, -jee euh/ , n. Psychiatry.
the practice of biting one's nails, esp. when done habitually and as a symptom of emotional disturbance.
[ 1895-1900; onycho- (comb. form of ónyx nail, claw; see ONYX) + -PHAGIA ]