Found 2 items, similar to endocardium.
English → English (WordNet) Definition: endocardium endocardium n : the membrane that lines the cavities of the heart and forms part of the heart valves [also: endocardia (pl)]
English → English (gcide) Definition: Endocardium Endocardium \En`do*car"di*um\, n. [NL., fr. Gr. 'e`ndon within + kardi`a heart.] (Anat.) The membrane lining the cavities of the heart. [1913 Webster]