(1) A removable storage medium (tape, disk, or memory chip). Some printers have slots in which you can insert cartridges to load different fonts. A font loaded from a cartridge is called a font cartridge or cartridge font.
The term removable cartridge usually refers to a type of hard disk that you can remove. Removable cartridges offer the speed of hard disks along with the portability of floppy disks.
(2) For laser and ink-jet printers, a toner cartridge is a metal container that holds the toner.