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ventricular septal defect

n.
  1. A congenital defect in the septum between the cardiac ventricles, usually resulting from failure of the spiral septum to close the interventricular foramen.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.