cartridge in WordNet English dictionary

1. ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun
   cartridge 
   
2. an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable
   cartridge  pickup 
   
3. a module designed to be inserted into a larger piece of equipment
   "he loaded a cartridge of fresh tape into the tape deck"
   cartridge 
   
4. a light-tight supply chamber holding the film and supplying it for exposure as required
   magazine  cartridge