2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Pericardium  \Per`i*car"di*um\,  n.  [NL.,  fr  Gr  ?,  fr  ?  about 
  or  near  the  heart;  ?  about  +  ?  heart.]  (Anat.) 
  The  double  baglike  fold  of  serous  membrane  which  incloses  the 
  heart. 
 
  Note:  The  inner  layer  is  closely  adherent  to  the  outer 
  surface  of  the  heart,  and  is  called  the  cardiac 
  pericardium.  The  outer  layer  loosely  incloses  the  heart 
  and  the  adherent  inner  layer,  and  is  called  the 
  parietal  pericardium.  At  the  base  of  the  heart  the  two 
  layers  are  continuous,  and  form  a  narrow  closed  cavity 
  filled  with  fluid,  in  which  the  pulsations  of  the  heart 
  cause  little  friction. 
 
  From  WordNet  r  1.6  [wn]: 
 
  pericardium 
  n  :  a  double-layered  serous  membrane  that  surrounds  the  heart 

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