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paranasal sinus in Medicine
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.