cylinder
cy·lin·der [cylinder cylinders] BrE [ˈsɪlɪndə(r)] NAmE [ˈsɪlɪndər] noun 
1. a solid or hollow figure with round ends and long straight sides
2. an object shaped like a cylinder, especially one used as a container
•a gas/oxygen cylinder
3. the hollow tube in an engine, shaped like a cylinder, inside which the ↑piston moves
•a six-cylinder engine
Idiom: ↑firing on all cylinders
Word Origin:
late 16th cent.: from Latin cylindrus, from Greek kulindros ‘roller’, from kulindein ‘to roll’.
Example Bank:
•All our aircraft carry at least one oxygen cylinder for emergency use on board.
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