: a case or container that holds a substance, device, or material which is difficult, troublesome, or awkward to handle and that usually can be easily changed: such as
a : a tube (as of metal) containing a complete charge for a firearm and usually an initiating device (such as a primer)
b : a case containing an explosive charge for blasting
c : an often cylindrical container for insertion into a larger mechanism or apparatus
e : a small case that contains a phonograph needle and transducer and is attached to a tonearm
f : a removable case containing a magnetic tape or one or more disks and used as a computer storage medium