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lacuna magna in Medicine

lacuna magna

(măgnə)
n.
  1. A recess on the roof of the navicular fossa of the urethra, formed by a fold of mucous membrane.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.