Webster's English Dictionary

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cartridge

car.tridge \'ka:r-trij, dial or archaic 'ka-trij\ n [alter. of earlier 
   cartage, modif. of MF cartouche] 1a: a tube of metal, paper, or both 
   containing a complete charge for a fire arm and usu. a cap or other 
   initiating device 1b: a case containing an explosive charge for blasting  
   2: an often cylindrical container of material for insertion into a large me 
   chanism or apparatus 3: a small case in a phonograph pickup containing the 
   needle and the mechan ism for translating stylus motion into electrical 
   voltage