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  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  Cordaitales 
  n  :  extinct  plants  having  tall  arborescent  trunks  comparable  to 
  or  more  advanced  than  cycads;  known  from  the 
  Pennsylvanian;  probably  extinct  since  the  Mesozoic  [syn: 
  {Cordaitales},  {order  Cordaitales}] 

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