Main Entry: nos·tril

Pronunciation: \ˈnäs-trəl\

Function: noun

Etymology: Middle English nosethirl, from Old English nosthyrl, from nosu nose + thyrel hole; akin to Old English thurh through

Date: before 12th century

1 : either of the external nares; broadly : either of the nares with the adjoining passage on the same side of the septum
2 : either fleshy lateral wall of the nose