nos‧tril /ˈnɒstrəl, ˈnɒstrɪl $ ˈnɑː-/
noun [countable][
Language: Old English;
Origin: nosthyrl 'nose-hole']
one 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) [TahlilGaran] Dictionary of Contemporary English ▲