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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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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