The Collaborative International Dictionary
Archimagus
Archimage \Ar"chi*mage\, ||Archimagus \Ar`chi*ma"gus\, n. [NL.; pref. archi- + L. magus, Gr. ?, a Magian.]
The high priest of the Persian Magi, or worshipers of fire.
A great magician, wizard, or enchanter.
--Spenser.
Wiktionary
archimagus
n. (alternative form of archimage English)