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
Moisture secreted through the nostrils evaporates as the camel breathes in,
  cooling the nostrils in the process.
Camel's nostrils are miracles of heat exchange and water recovery engineering.
Faces turned upward, so that their nostrils are out of water, they creep toward
  the land at the same rate as the tide.
His eyes were bright, his jaw set, excitement flickering around the edge of his
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