Source : Webster's Revised Unabridged Dictionary (1913)

Pericardiac \Per`i*car"di*ac\, Pericardial \Per`i*car"di*al\, a.
   (Anat.)
   Of or pertaining to pericardium; situated around the heart.

   {Pericardial fluid} (Physiol.), a serous fluid of a pale
      yellow color contained in the pericardium.