Etymology
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reformer (n.)

mid-15c., "corrector, improver; mediator, negotiator," agent noun from reform (v.). From 1540s as "one who leads or assists the religious movements of the 16c. aimed at reformation of Christianity;" also "one who promotes or favors reform in certain practices of things."

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Definitions of reformer

reformer (n.)
a disputant who advocates reform;
Synonyms: reformist / crusader / social reformer / meliorist
reformer (n.)
an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel;
a catalytic reformer
From wordnet.princeton.edu