frontal sinus

frontal sinus definition - medical

frontal sinus

noun
A hollow formed on either side in the lower part of the squama of the frontal bone, communicating by the ethmoidal infundibulum with the middle meatus of the nasal cavity of the same side.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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