Source : Webster's Revised Unabridged Dictionary (1913)

Adulterator \A*dul"ter*a`tor\, n. [L.]
   One who adulterates or corrupts. [R.] --Cudworth.

Source : WordNet®

adulterator
     n 1: any substance that adulterates (lessens the purity or
          effectiveness of a substance); "it is necessary to
          remove the adulterants before use" [syn: {adulterant}]
     2: a changer who lessens the purity or effectiveness of a
        substance