epimyocardium
noun
epi·myo·car·di·um
ˌep-ə-ˌmī-ə-ˈkärd-ē-əm
plural epimyocardia
-ē-ə
: the undifferentiated splanchnic mesodermal layer of the embryonic heart that subsequently differentiates into myocardium and epicardium
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Merriam-Webster unabridged
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