the thin endothelial membrane lining the cavities of the heart
Origin of endocardiumModern Latin from endo- + Classical Greek kardia, heart
The thin serous membrane, composed of endothelial tissue, that lines the interior of the heart.
Origin of endocardiumNew Latin endo- Greek kardiā heart ; see kerd- in Indo-European roots.
- (anatomy, cardiology) A thin serous membrane that lines the interior of the heart.