The Collaborative International Dictionary of English v.0.48:

Restitutor \Res"ti*tu`tor\ (r?s"t?*t?`t?r), n. [L.: cf. F.
   restituteur.]
   One who makes restitution. [R].
   [1913 Webster]

The Devil's Dictionary (1881-1906):

RESTITUTOR, n.  Benefactor; philanthropist.