noun, plural epicardia [ep-i-kahr-dee-uh] . Anatomy.
the inner serous layer of the pericardium, lying directly upon the heart.

1860–65; < Neo-Latin; see epi-, -cardium

epicardial, epicardiac, adjective
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World English Dictionary
epicardium (ˌɛpɪˈkɑːdɪəm)
n , pl -dia
anatomy the innermost layer of the pericardium, in direct contact with the heart
[C19: New Latin, from epi- + Greek kardia heart]

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American Heritage
Medical Dictionary

epicardium ep·i·car·di·um (ěp'ĭ-kär'dē-əm)
n. pl. ep·i·car·di·a (-dē-ə)
The inner layer of the pericardium that is in contact with the surface of the heart. Also called visceral layer.

ep'i·car'di·al adj.
The American Heritage® Stedman's Medical Dictionary
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