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
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endocardium
nounen·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
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Time Traveler for endocardium
The first known use of endocardium was circa 1864
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