Webster's English Dictionary

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nostril

nos.tril \'na:s-tr*l\ n [ME nosethirl, fr. OE nosthyrl, fr. nosu nose + 
   thyrel]hole; akin to OE thurh through 1: an external naris; broadly : a 
   naris with the adjoining passage  on the same side of the nasal septum 2: 
   the fleshy lateral wall of the nose