[zawr-oh-as-tree-uh-niz-uh
m, zohr-] 
| an Iranian religion, founded c600 b.c. by Zoroaster, the principal beliefs of which are in the existence of a supreme deity, Ahura Mazda, and in a cosmic struggle between a spirit of good, Spenta Mainyu, and a spirit of evil, Angra Mainyu. |
| Maz·da·ism also Maz·de·ism (māz'də-ĭz'əm) n. Zoroastrianism. [From Avestan mazdå, the good principle, from mazdā-, wise; see Ahura Mazda.] |