Definition of cylinder noun from the Oxford Advanced Learner's Dictionary

     

    cylinder

     noun
    noun
    BrE BrE//ˈsɪlɪndə(r)//
     
    ; NAmE NAmE//ˈsɪlɪndər//
     
     
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  1. 1 a solid or hollow figure with round ends and long straight sides
  2. 2an object shaped like a cylinder, especially one used as a container a gas/oxygen cylinder All our aircraft carry at least one oxygen cylinder for emergency use on board.
  3. 3the hollow tube in an engine, shaped like a cylinder, inside which the piston moves a six-cylinder engine
  4. Word Origin late 16th cent.: from Latin cylindrus, from Greek kulindros ‘roller’, from kulindein ‘to roll’.Idioms
    working/firing on all cylinders
     
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    (informal) using all your energy to do something; working as well as possible
See the Oxford Advanced American Dictionary entry: cylinder