Source : WordNet®

Catharism
     n : a Christian movement considered to be a medieval descendant
         of Manichaeism in southern France in the 12th and 13th
         centuries; characterized by dualism (asserted the
         coexistence of two mutually opposed principles, one good
         and one evil); was exterminated for heresy during the
         Inquisition [syn: {Albigensianism}]