either of the two external openings of the nose.

before 1000; Middle English nostrill, Old English nosterl, variant of nosthyrl, equivalent to nos(u) nose + thyrel hole; see thirl Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nostril (ˈnɒstrɪl)
either of the two external openings of the noseRelated: narial, narine
Related: narial, narine
[Old English nosthyrl, from nosunose + thyrel hole]

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

O.E. nosþyrl, lit. "the hole of the nose," from nosu "nose" + þyrel "hole," from þurh "through."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

nostril nos·tril (nŏs'trəl)
A naris.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Do the same at the tip and nostril of your nose and behold, no sound and no
Digital also offers predictive control: you can know exactly how his head will
  shatter, down to each jettisoned nostril.
Without my permission, she pierced her nose and now has a small stud in her
As you walk in, one approaches with an eyebrow raised and nose aloft to give
  you the benefit of full-frontal froggy nostril.
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