[ˏzɔrәu'æstriәnizәm]
n.
索罗亚斯德教, 拜火教, 袄教, 火教, 火袄教, 明教

[ noun ]
system of religion founded in Persia in the 6th century BC by Zoroaster; set forth in the Zend-Avesta; based on concept of struggle between light (good) and dark (evil)
<noun.cognition>

Zoroastrianism \Zo`ro*as"tri*an*ism\, n.
The religious system of Zoroaster, the legislator and prophet
of the ancient Persians, which was the national faith of
Persia; mazdeism. The system presupposes a good spirit
(Ormuzd) and an opposing evil spirit (Ahriman). Cf. {Fire
worship}, under {Fire}, and {Parsee}.