epimyocardium

noun
epi·​myo·​car·​di·​um | \ˌep-ə-ˌmī-ə-ˈkärd-ē-əm \
plural epimyocardia\-​ē-​ə \

Medical Definition of epimyocardium 

: the undifferentiated splanchnic mesodermal layer of the embryonic heart that subsequently differentiates into myocardium and epicardium

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