DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   dud
       adj 1: failing to detonate; especially not charged with an
              active explosive; "he stepped on a dud mine"
       n 1: someone who is unsuccessful [syn: flop, dud, washout]
       2: an explosion that fails to occur [syn: misfire, dud]
       3: an event that fails badly or is totally ineffectual; "the
          first experiment was a real turkey"; "the meeting was a dud
          as far as new business was concerned" [syn: turkey, bomb,
          dud]