nasal meatus

Medical Dictionary

nasal meatus n.
Any of three passages, designated inferior, middle, and superior, in the nasal cavity that are formed by the projection of the ethmoidal crests.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
nasal meatus

noun
the passages in the nasal cavity formed by the projections of the nasal conchae 
WordNet® 3.0, © 2006 by Princeton University.
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