Source : Webster's Revised Unabridged Dictionary (1913)

Adiaphorist \Ad`i*aph"o*rist\, n. [See {Adiaphorous}.] (Eccl.
   Hist.)
   One of the German Protestants who, with Melanchthon, held
   some opinions and ceremonies to be indifferent or
   nonessential, which Luther condemned as sinful or heretical.
   --Murdock.