n.1.Ancient Persian religion, esp. as represented by the Magi.
This system we shall call 'Persism', in order to free ourselves of the popular associations still connected with such terms as magism, Parseeism, and so forth; meaning by 'Persism' the teaching of Zarathustra as it affected the Greek and Latin world.
- E. Vernon Arnold.
1.A Persian idiom.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.