nostril

[nos-truhl]
noun
either of the two external openings of the nose.

Origin:
before 1000; Middle English nostrill, Old English nosterl, variant of nosthyrl, equivalent to nos(u) nose + thyrel hole; see thirl

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World English Dictionary
nostril (ˈnɒstrɪl)
 
n
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
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Etymonline
Word Origin & History

nostril
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)
n.
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
  sense.
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
  nostril.
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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