noun

1. 1. the hair that a man has let grow out on his upper lip: sometimes used in the plural in reference to the two halves of this growth
   2. hair growing on the upper lip at fourteen he's already getting a mustache
2. the hair or bristles growing about the mouth in some animals

Etymology: Fr moustache < It mostacchio, mustache < MGr mustaki < Gr mystax, upper lip, mustache < mastax, a mouth, jaws < IE base *menth- > mouth