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idiopathic hypertrophic subaortic stenosis

n.
  1. Obstruction of the flow of blood out of the left ventricle due to hypertrophy of the ventricular septum.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.