The Collaborative International Dictionary of English v.0.48:
Endocardiac \En`do*car"di*ac\, Endocardial \En`do*car"di*al\, a.
1. Pertaining to the endocardium.
[1913 Webster]
2. (Med.) Seated or generated within the heart; as,
endocardial murmurs.
[1913 Webster]