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onychophagia

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

1895–1900; < Greek onycho- (combining form of ónyx nail, claw; see onyx) + -phagia
Related formson·y·choph·a·gist [on-uh-kof-uh-jist] /ˌɒn əˈkɒf ə dʒɪst/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018