cartridge

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

(noun) a light-tight supply chamber holding the film and supplying it for exposure as required. Synonyms: magazine.

(noun) a module designed to be inserted into a larger piece of equipment. Example: "He loaded a cartridge of fresh tape into the tape deck."

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