mustache, n. [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.].
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That part of the beard which grows on the upper lip; hair left growing above the mouth. [1913 Webster]
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A West African monkey (Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose. [1913 Webster]
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Any conspicuous stripe of color on the side of the head, beneath the eye of a bird. [1913 Webster]
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A stain or discoloration on the upper lip of a person; as, wearing a milk mustache. [PJC]