en·do·car·di·um (ěn'dō-kär'dē-əm) n.
pl.en·do·car·di·a (-dē-ə) The thin serous membrane, composed of endothelial tissue, that lines the interior of the heart.
[New Latin : endo- + Greek kardiā, heart; see kerd- in Indo-European roots.] en'do·car'di·al adj.
Main Entry: en·do·car·di·um Pronunciation: -'kärd-E-&m Function: noun Inflected Form: pluralen·do·car·dia/-E-&/ : a thin serous membrane lining the cavities of the heart
endocardium en·do·car·di·um (ěn'dō-kär'dē-əm) n.pl.en·do·car·di·a (-dē-ə) The thin serous membrane, composed of endothelial and subendothelial tissue, that lines the interior of the heart.