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·al Pronunciation: -'kärd-E-&l Function: adjective 1: situated within the heart 2: of or relating to the endocardium <endocardial biopsy>