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ethmoidectomy

(ĕth′moi-dĕktə-mē)
n.
  1. Removal of all or a part of the mucosal lining and bony partitions between the ethmoid 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.