From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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