endocardium

noun
en·​do·​car·​di·​um | \ˌen-dō-ˈkär-dē-əm \
plural endocardia\ˌen-​dō-​ˈkär-​dē-​ə \

Definition of endocardium 

: a thin serous membrane lining the cavities of the heart

First Known Use of endocardium

circa 1864, in the meaning defined above

History and Etymology for endocardium

New Latin

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The first known use of endocardium was circa 1864

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More Definitions for endocardium

endocardium

noun
en·​do·​car·​di·​um | \-ˈkärd-ē-əm \
plural endocardia\-​ē-​ə \

Medical Definition of endocardium 

: a thin serous membrane lining the cavities of the heart

More from Merriam-Webster on endocardium

Britannica.com: Encyclopedia article about endocardium

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