endocardial fibroelastosis

n.
  1. A congenital condition characterized by thickening of the inner lining of the left ventricle, thickening and malformation of the cardiac valves, and hypertrophy of the heart.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.