01 n. That part of the beard which grows on the upper lip; hair left growing above the mouth.
pl.
Mustaches
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1.
That part of the beard which grows on the upper lip; hair left growing above the mouth.
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2.
A West African monkey (Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose.(Zool.)
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3.
Any conspicuous stripe of color on the side of the head, beneath the eye of a bird.(Zool.)
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4.
A stain or discoloration on the upper lip of a person; as, wearing a milk mustache.[informal]