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ethmoidal sinus in Medicine

ethmoidal sinus

n.
  1. Any of the evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity, subdivided into anterior, middle, and posterior sinuses.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.