Anatomy. the ridge over the eye.
the hair growing on that ridge; eyebrow.
the forehead: He wore his hat low over his brow.
a person's countenance or mien.
the edge of a steep place: She looked down over the brow of the hill.

before 1000; Middle English browe, Old English brū; akin to Old Norse brūn, Sanskrit bhrūs

brows, browse. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brow (braʊ)
1.  the part of the face from the eyes to the hairline; forehead
2.  short for eyebrow
3.  the expression of the face; countenance: a troubled brow
4.  the top of a mine shaft; pithead
5.  the jutting top of a hill, etc
6.  dialect (Northern English) a steep slope on a road
[Old English brū; related to Old Norse brūn eyebrow, Lithuanian bruvis, Greek ophrus, Sanskrit bhrūs]

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

words for "eyelid," "eyelash," and "eyebrow" changed about maddeningly in O.E. and M.E. (and in all the W.Gmc. languages). Linguists have untangled the knot into two strands: 1. O.E. bræw (Anglian *brew) "eyelid," from P.Gmc. *bræwi- "blinker, twinkler" (related to Goth. brahw "twinkle, blink,"
in phrase in brahwa augins "in the twinkling of an eye"); the sense must have shifted before the earliest recorded O.E. usage from "eyelash" to "eyelid." 2. O.E. bru "eyelash," from P.Gmc. *brus "eyebrow," from PIE base *bhrus (cf. Skt. bhrus "eyebrow," Gk. ophrys, O.C.S. bruvi, Lith. bruvis "brow," O.Ir. bru "edge"). The sense must have been transferred in O.E. at an early date from "eyebrow" to "eyelash." Lacking a distinctive word for it, the Anglo-Saxons called an eyebrow ofer-bru, and in early M.E. they were known as uvere breyhes or briges aboue þe eiges. By c.1200, everything had moved "up." Bru/brouw (from bræw) became "eyelid;" and brew/breow (from O.E. bru) became "eyebrow." It remained the word for "eyebrow" in Scottish and northern English, where it naturally evolved into colloquial bree. In southern English, however, M.E. bru/brouw took over the sense of "eyebrows," in the form brues, and yielded the usual modern form of the word. To make matters worse, if possible, some southern writers 15c.-17c. used bree for "eyelashes," in what OED calls "a curious reversion to what had been the original OE. sense of bru." By 1530s, brow had been given an extended sense of "forehead," especially with reference to movements and expressions that showed emotion or attitude. The -n- in the O.N. (brun) and Ger. (braune) forms of the word are from a gen. pl. inflection.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

brow (brou)

  1. The eyebrow.

  2. See forehead.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
But that isn't to say that low-brow stuff is easier to render.
They are often motivated by forms of low-brow nationalism, but it's wrong to caste them off as simple provincialism.
Neither is compensation determined by the sweat of one's brow.
Another possibility is that the high brow and pointy chin dramatically
  distinguish our faces from those of other mammals.
Image for brow
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