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 Cathar&imacron;, from Late Greek Katharoi, from pl. of Greek katharos, pure.