MOUSTACHE, or MUSTACHIO, the hair worn unshaven on the upper lip (see BEARD). The spelling " moustache," now the most common in English usage, is the French form of Ital. mustachio, an adaptation of a Doric dialectical ^iiara^, upper lip, also hair on the lip; this is generally taken to be a variant of /idora, jaws, mouth, connected with na.qa.aQai, to chew; cf. " mastic," chewing-gum, and " masticate," to chew.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)