D defs.my
Entry 2 senses Webster, 1913

Reformer

/(r?*f?rm"?r)/ · Re·form·er · IPA /rɪfˈɔrmər/
01 n. One who effects a reformation or amendment; one who labors for, or urges, reform; as, a reformer of manners, or of abuses.
  1. 1.
    One who effects a reformation or amendment; one who labors for, or urges, reform; as, a reformer of manners, or of abuses.
  2. 2.
    One of those who commenced the reformation of religion in the sixteenth century, as Luther, Melanchthon, Zwingli, and Calvin.(Eccl.Hist.)