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The Collaborative International Dictionary
Cercopithecus cephus

Mustache \Mus*tache"\ (m[u^]s*t[.a]sh"; 277), n.; pl. Mustaches. [Written also moustache.] [F. moustache, It. mostaccio visage, mostacchio mustache, fr. Gr. my`stax upper lip and the beard upon it; cf. ma`stax mouth: cf. Sp. mostacho.]

  1. That part of the beard which grows on the upper lip; hair left growing above the mouth.

  2. (Zo["o]l.) A West African monkey ( Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose.

  3. (Zo["o]l.) Any conspicuous stripe of color on the side of the head, beneath the eye of a bird.

  4. A stain or discoloration on the upper lip of a person; as, wearing a milk mustache. [informal]