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Definition of: epicardium
(ep′ə·kär′dē·əm) noun plural ·di·a (-dē·ə) Anat.
The portion of the pericardium that is directly united with the substance of the heart. [<NL <Gk. epi- upon + kardia heart]
—ep′i·car′di·ac (-ak), ep′i·car′di·al adjective
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