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presystolic murmur

n.
  1. A murmur heard at the end of ventricular diastole, during atrial systole, usually due to obstruction at an atrioventricular orifice.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.