nostril

[ nos-truh l ]
/ ˈnɒs trəl /

noun

either of the two external openings of the nose.

Origin of nostril

before 1000; Middle English nostrill, Old English nosterl, variant of nosthyrl, equivalent to nos(u) nose + thyrel hole; see thirl
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for nostrils

nostril

/ (ˈnɒstrɪl) /

noun

either of the two external openings of the noseRelated adjectives: narial, narine

Word Origin for nostril

Old English nosthyrl, from nosu nose + thyrel hole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for nostrils

nostril

[ nŏstrəl ]

n.

A naris.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.