Definition of nostril noun from the Oxford Advanced Learner's Dictionary

 

nostril

 noun
noun
BrE BrE//ˈnɒstrəl//
 
; NAmE NAmE//ˈnɑːstrəl//
 
Face
 
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either of the two openings at the end of the nose that you breathe through The horse flared its nostrils. The smell of decay lingered in her nostrils. The stench of the cellar filled my nostrils. See related entries: Face Word Origin Old English nosterl, nosthyrl, from nosu ‘nose’ + thȳr(e)l ‘hole’.
See the Oxford Advanced American Dictionary entry: nostril