The Collaborative International Dictionary of English v.0.48:
Pericardiac \Per`i*car"di*ac\, Pericardial \Per`i*car"di*al\, a. (Anat.) Of or pertaining to pericardium; situated around the heart. [1913 Webster] Pericardial fluid (Physiol.), a serous fluid of a pale yellow color contained in the pericardium. [1913 Webster]