Other forms: magi
A magus is a follower of Zoroastrianism, an ancient religion. You can also use magus to mean "magician" or "wise man."
In ancient Persia, a Zoroastrian priest (or a member of that particular caste) was a magus. The word's meaning grew to include practitioners of astrology and magic, but in English its plural form, magi, is most commonly used for the three wise men, or magi, who are described visiting Jesus in the Bible. Magus means "magician" in Latin, and its roots go back to the Old Persian magush, also "magician."