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hydropericardium

(hī′drō-pĕr′ĭ-kärdē-əm)
n.
  1. The noninflammatory accumulation of watery fluid in the pericardial cavity.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.