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The Collaborative International Dictionary of English v.0.48 (gcide)

Nostril \Nos"tril\, n. [OE. nosethril, nosethirl, AS.
nos[thorn]yrl; nos for nosu nose [thorn]yrel opening, hole,
from [thorn]yrel pierced, for [thorn]yrhel, fr. purh through.
[root]261. See {Nose}, and {Through}, and cf. {Thrill}.]
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1. (Anat.) One of the external openings of the nose, which
give passage to the air breathed and to secretions from
the nose and eyes; one of the anterior nares.
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Note: In sperm whales, porpoises, and allied animals, there
is only one nostril, which is situated on the top of
the head and called a spiracle.
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2. Perception; insight; acuteness. [Obs.]
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Methinks a man
Of your sagacity and clear nostril should
Have made another choice. --B. Jonson.
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