'Depreciator' definitions:

Definition of 'depreciator'

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

Definition of 'Depreciator'

From: GCIDE
  • Depreciator \De*pre"ci*a`tor\, n. [L.] One who depreciates. [1913 Webster]