What is Cartridge ?
Cartridge is (noun) 1. a tube packed with gunpowder and a bullet for firing from a gun The ground was littered with empty cartridges. 2. a flat box containing a disk or tape The handheld computer has no disk drive but instead uses a ROM cartridge. 3. the part of a record player which holds the stylus A new cartridge for this record player will be quite expensive. 4. a tube of ink which fits into a pen Most pens are now made to use ink cartridges.
source: Easier English, Student Dictionary Upper Intermediate Level