paranasal sinus

Medical Dictionary

paranasal sinus par·a·na·sal sinus (pār'ə-nā'zəl)
n.
Any of the paired cavities, designated frontal, sphenoidal, maxillary, and ethmoidal, located in the bones of the face and lined by a mucous membrane continuous with that of the nasal cavity.

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
paranasal sinus

noun
any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities 
WordNet® 3.0, © 2006 by Princeton University.
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