A type of magic user or spellcaster in various systems, or a Pathfinder martial/spellcaster class. Use this when the thing you're asking about in your game system is called a Magus.
The Magus is a Pathfinder class that blends spellcasting with martial prowess. It has moderate weapon skills coupled with a slower spell progression, gaining spells of up to 6th level. It combines these two with its signature Spell Combat class feature, casting spells through weapon attacks.