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