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hemiblock

(hĕmē-blŏk′)
n.
  1. Arrest of the cardiac impulse in one of the two main divisions of the left branch of the atrioventricular trunk.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.