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sphenoidal sinus

sphenoidal sinus in Medicine

sphenoidal sinus n.
Either of a pair of cavities in the body of the sphenoid bone that communicate with 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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