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nostril (n.)

"one of the external openings of the nose, a nasal orifice," late 14c., nostrille, from Old English nosþyrl, nosðirl, literally "the hole of the nose," from nosu "nose" (from PIE root *nas- "nose") + þyrel "hole" (from PIE root *tere- (2) "cross over, pass through, overcome"). For metathesis of -r- and vowel, see wright. After the second element became obsolete as an independent, its form was corrupted in the compound.

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Definitions of nostril from WordNet

nostril (n.)
either one of the two external openings to the nasal cavity in the nose;
Synonyms: anterior naris
From wordnet.princeton.edu