[muhs-tash, muh-stash]
the hair growing on the upper lip
such hair on men, allowed to grow without shaving, and often trimmed in any of various shapes.
hairs or bristles growing near the mouth of an animal.
a stripe of color, or elongated feathers, suggestive of a mustache on the side of the head of a bird.
something resembling a mustache, as food or drink adhering to the upper lip: a mustache of milk.
Also, moustache.

1575–85; < Middle French moustache < Italian mostaccio; see mustachio

mustached, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moustache or mustache (məˈstɑːʃ)
1.  the unshaved growth of hair on the upper lip, and sometimes down the sides of the mouth
2.  a similar growth of hair or bristles (in animals) or feathers (in birds)
3.  a mark like a moustache
[C16: via French from Italian mostaccio, ultimately from Doric Greek mustax upper lip]
mustache or mustache
[C16: via French from Italian mostaccio, ultimately from Doric Greek mustax upper lip]
mous'tached or mustache
mus'tached or mustache

mustache (məˈstɑːʃ)
the US spelling of moustache

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1580s, from Fr. moustache, from It. mostaccio, from Medieval Gk. moustakion, dim. of Doric mystax (gen. mystakos) "upper lip, mustache," related to mastax "jaws, mouth," lit. "that with which one chews," from PIE base *mnto- "mouth" (see mouth). Borrowed earlier (1550s) as
mostacchi, from the It. word or its Sp. derivative mostacho. The plural form of this, mustachios, lingers in English. Dutch slang has a useful noun, de befborstel, to refer to the mustache specifically as a tool for stimulating the clitoris; probably from beffen "to stimulate the clitoris with the tongue."
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


hair grown on the upper lip by men. The wearing of mustaches, like beards, has been since antiquity a reflection of such factors as climate (local or temporal), custom, religious belief, and personal taste. It was usual in the past to make no distinction between a mustache and other facial hair such as a beard or whiskers, as these were usually worn together. As early as 2650 BC, however, Egyptian artifacts show a pencil-line mustache with no beard

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Foreigners' residency permits require information about the shape of one's nose
  and the style of one's mustache.
You've got your spats on, your mustache is all waxed and ready.
His brown eyes and the large wart over his mustache seemed to have shrunk.
Unless, perhaps, you have allergies and your mustache is trapping pollen.
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