Source : Webster's Revised Unabridged Dictionary (1913)

Reformist \Re*form"ist\, n. [Cf. F. r['e]formiste.]
   A reformer.

Source : WordNet®

reformist
     adj : favoring or promoting reform (often by government action)
           [syn: {progressive}, {reform-minded}]
     n : a disputant who advocates reform [syn: {reformer}, {crusader},
          {meliorist}]