en·do·car·di·a (ěn'dō-kär'dē-ə) n. Plural of endocardium. |
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.