grew a moustache later in his life.]] For the Swedish heavy metal band, see Mustasch. A moustache (or mustache) is facial hair grown on the upper lip. Often the term implies that the wearer grows only the upper lip hair and chooses to shave the hair on his chin and cheeks, whereas growth of all facial hair would constitute a beard. Etymology The word Moustache comes to the English language via the Middle French Moustache which in turn is derived from the Old Italian Mustacchio which originates from the Middle Greek Moustaki, a diminutive of Greek mystak-, mystax upper lip, mustache.[LINK: http://www.britannica.com/dictionary?book=Dictionary&va=mustache&query=mustache/] Encyclopædia Britannica Online - Merriam-Webster's Online Dictionary The word is pronounced with the