Either of a pair of cavities in the body of the sphenoid bone that communicate with the nasal cavity.
THIS 5TH GRADE VOCABULARY QUIZ COVERS ALL THE BASICS
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Question 1 of 10
Words nearby sphenoidal sinus
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.