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mus·tache / ˈməsˌtash; məˈstash/ (also mous·tache) • n. a strip of hair left to grow above the upper lip. ∎  (mustaches) a long mustache. ∎  a similar growth, or a marking that resembles it, around the mouth of some animals. DERIVATIVES: mus·tached adj. ORIGIN: late 16th cent.: from French, from Italian mostaccio, from Greek mustax, mustak-.