from
The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]
2. (Zool.) A West African monkey ({Cercopithecus cephus}). It
has yellow whiskers, and a triangular blue mark on the
nose.
[1913 Webster]
3. (Zool.) Any conspicuous stripe of color on the side of the
head, beneath the eye of a bird.
[1913 Webster]
4. A stain or discoloration on the upper lip of a person; as,
wearing a milk mustache. [informal]
[PJC]