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pyopericardium

(pī′ō-pĕr′ĭ-kärdē-əm)
n.
  1. An accumulation of pus in the pericardial sac.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.