epimyocardium

noun
epi·​myo·​car·​di·​um | \ ˌep-ə-ˌmī-ə-ˈkärd-ē-əm How to pronounce epimyocardium (audio) \
plural epimyocardia\ -​ē-​ə How to pronounce epimyocardia (audio) \

Medical Definition of epimyocardium

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

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