Merriam-Webster Collegiate Dictionary - mustache

 also moustache  noun  Etymology: Middle French moustache, from Old Italian mustaccio, from Middle Greek moustaki, diminutive of Greek mystak-, mystax upper lip, ~  Date: 1585  1. the hair growing on the human upper lip; especially such hair grown and often trimmed in a particular style  2. hair or bristles about the mouth of a mammal  • ~d also moustached adjective