Definition of "Cartridge" :

noun: ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun

noun: an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable

noun: a module designed to be inserted into a larger piece of equipment

"He loaded a cartridge of fresh tape into the tape deck."

noun: a light-tight supply chamber holding the film and supplying it for exposure as required