nostril nostril /ˈnɑːstrɪl/

noun

1. Either one of the two external openings to the nasal cavity in the nose  ( anterior naris , nostril )
   either one of the two external openings to the nasal cavity in the nose
    She could feel the cool air entering her nostrils as she took a deep breath
   She could feel the cool air entering her nostrils as she took a deep breath