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 d o ra , upper lip, also hair on the lip; this is generally taken to be a variant of µaura , jaws, mouth, connected with µavavBae, to chew; cf . " mastic," chewing-gum, and " masticate," to chew .