Etymology
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trichotillomania (n.)

1905, from French trichotillomanie (1889), from tricho-, Latinized form of Greek trikho-, combining form of thrix (genitive trikhos) "hair" + Greek tillesthai "to pull out" + mania.

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Definitions of trichotillomania

trichotillomania (n.)
an irresistible urge to pull out your own hair;
From wordnet.princeton.edu