'Endocardium' definitions:
Definition of 'endocardium'
(from WordNet)
noun
The membrane that lines the cavities of the heart and forms part of the heart valves
Definition of 'Endocardium'
From: GCIDE
- 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]