cartridge

car|tridge /k'ɑːrtrɪdʒ/ (cartridges)
1 [N-COUNT]
A cartridge is a metal or cardboard tube containing a bullet and an explosive substance. Cartridges are used in guns.
2 [N-COUNT]
A cartridge is part of a machine or device that can be easily removed and replaced when it is worn out or empty.

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