nounpl. Cath·a·ri, or Cath·ars
A member of a Christian sect flourishing in western Europe in the 1100s and 1200s, whose dualistic belief, embracing asceticism and identifying the world as the creation of a satanic Demiurge, was condemned by the Church as heretical.
Origin of CatharFrench Cathare from sing. of Medieval Latin Catharī from Late Greek Katharoi from pl. of Greek katharos pure