De·tract·or n.  One who detracts; a derogator; a defamer.
     His detractors were noisy and scurrilous.   --Macaulay.
  Syn: -- Slanderer; calumniator; defamer; vilifier.
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  detractor
       n : one who disparages or belittles the worth of something [syn:
            disparager, depreciator, knocker]