The Collaborative International Dictionary of English v.0.48:
magus \magus\ n. 1. a magician or sorcerer of ancient times. [WordNet 1.5] 2. a member of the Zoroastrian priesthood of the ancient Persians. [WordNet 1.5]WordNet (r) 3.0 (2006):
magus n 1: a magician or sorcerer of ancient times 2: a member of the Zoroastrian priesthood of the ancient Persians