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ethmoidal sinus

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ethmoidal sinus

noun
a sinus of the meatuses of the nasal cavity (behind the bridge of the nose) [syn: ethmoid sinus
WordNet® 3.0, © 2006 by Princeton University.
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Medical Dictionary

ethmoidal sinus n.
Any of the evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity, subdivided into anterior, middle, and posterior sinuses.

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