'Detractor' definitions:

Definition of 'detractor'

(from WordNet)
noun
One who disparages or belittles the worth of something [syn: detractor, disparager, depreciator, knocker]

Definition of 'Detractor'

From: GCIDE
  • Detractor \De*tract"or\, n. [L.: cf. F. d['e]tracteur.] One who detracts; a derogator; a defamer. [1913 Webster]
  • His detractors were noisy and scurrilous. --Macaulay.
  • Syn: Slanderer; calumniator; defamer; vilifier. [1913 Webster]