Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
the religious system of the Persians before their conversion to Islam: it was founded by Zoroaster, and its principles, contained in the Avesta, include belief in an afterlife and in the continuous struggle of the universal spirit of good (Ormazd) with the spirit of evil (Ahriman), the good ultimately to prevail
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The religious system founded by Zoroaster and set forth in the Avesta, teaching the worship of Ahura Mazda in the context of a universal struggle between the forces of light and of darkness.
- Zoˌro·asˈtri·an adjective & n.