Webster's English Dictionary

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moustache

mous.tache \'m*s-.tash, (.)m*s-'\ n [MF, fr. OIt mustaccio, fr. MGk 
   moustaki, dim. of Gk mystak-,] mystax upper lip, moustache 1: the hair 
   growing on the human upper lip  2: hair or bristles about the mouth of a 
   mammal