The Collaborative International Dictionary of English v.0.48:

Defrauder \De*fraud"er\, n.
   One who defrauds; a cheat; an embezzler; a peculator.
   [1913 Webster]

WordNet (r) 3.0 (2006):

defrauder
    n 1: a person who swindles you by means of deception or fraud
         [syn: swindler, defrauder, chiseller, chiseler,
         gouger, scammer, grifter]