From Longman Dictionary of Contemporary Englishnostrilnos‧tril /ˈnɒstrəl $ ˈnɑː-/ noun [countable] HBone of the two holes at the end of your nose, through which you breathe and smell things The smell of gunpowder filled his nostrils. the horse’s flaring nostrils (=widened nostrils)
Examples from the Corpus
nostril• There were two cavernous nostrils and Nuadu realised that this was the reason for the hissing whispering voice.• In front there were two eyes and a single central nostril, like that of a lamprey.• And her nostrils caught the smell of charring wood.• When she came to, the acrid tingling of sal volatile was in her nostrils.• She pokes the other end inside her nostril.• Magee could feel it clogging his nostrils.• Her almost flat nose tended to widen at the nostrils, flaring over a tidal wave of a mouth.Origin nostril Old English nosthyrl “nose-hole” 