eyebrow

[ahy-brou]
noun
1.
the arch or ridge forming the upper part of the orbit of the eye.
2.
the fringe of hair growing on this arch or ridge.
3.
a dormer having a roof that is an upwardly curved continuation of the main roof plane.
4.
Printing, Journalism, kicker ( def 9 ).
5.
Nautical. a curved molding protecting a port from falling or dripping water.

Origin:
1575–85; eye + brow

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
eyebrow (ˈaɪˌbraʊ)
 
n
1.  the transverse bony ridge over each eye
2.  the arch of hair that covers this ridgeRelated: superciliary
3.  raise an eyebrow See raise
 
Related: superciliary

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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Etymonline
Word Origin & History

eyebrow
1580s, from eye + brow (O.E. eagbræw meant "eyelid").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

eyebrow eye·brow (ī'brou')
n.

  1. The bony ridge that extends over the eye.

  2. The arch of short hairs that covers this ridge.

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
Idioms & Phrases

eyebrow

see cause raised eyebrows.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The dreamer sees him lying on the bed with a wound over his left eyebrow, which
  runs off vertically.
If your friend scratches her eyebrow or crosses her arms, studies suggest, odds
  are you'll unthinkingly mimic the gesture.
The ability to communicate subtle emotions with a simple raised eyebrow or curl
  of the lip may be innate.
Out of context, many of our behaviors-if limited to the mere veneer of plain
  description-would raise many an eyebrow.
Idioms & Phrases
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