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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Crissum  \Cris"sum\  (kr?s"s?m),,  n.;  pl  {Crissa}  (-s?).  [NL.; 
  cf  L.  crisso  to  move  the  haunches.]  (Zo["o]l.) 
  That  part  of  a  bird,  or  the  feathers,  surrounding  the  cloacal 
  opening;  the  under  tail  coverts.