an unbeliever; a non-Muslim, especially a Christian.
Origin: 1555–65; earlier gower, gour < Turkishgâvur < Persiangaur, variant of gabr Zoroastrian, non-Muslim; spelling giaour < French, with gi- representing Turk palatalized g, later taken as spelling for j
1564, Turk. term of contempt for non-Muslims, from Pers. gaur, variant of gabr "fire-worshipper," originally applied to the adherents of the Zoroastrian religion.