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atrial septal defect in Medicine

atrial septal defect

n.
  1. A defect in the interatrial septum of the heart, due to failure of the embryonic foramen to close normally.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.