Zoroastrianism

noun

Zo·​ro·​as·​tri·​an·​ism ˌzȯr-ə-ˈwa-strē-ə-ˌni-zəm 

: a Persian religion founded in the sixth century b.c. by the prophet Zoroaster, promulgated in the Avesta, and characterized by worship of a supreme god Ahura Mazda who requires good deeds for help in his cosmic struggle against the evil spirit Ahriman

Zoroastrian

ˌzȯr-ə-ˈwa-strē-ən 

adjective or noun

Word History

First Known Use

1849, in the meaning defined above