Search Result for "endocardium": 
Wordnet 3.0

NOUN (1)

1. the membrane that lines the cavities of the heart and forms part of the heart valves; 



The Collaborative International Dictionary of English v.0.48:

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]


WordNet (r) 3.0 (2006):

endocardium
    n 1: the membrane that lines the cavities of the heart and forms
         part of the heart valves