Definition of cylinder noun from the Oxford Advanced American Dictionary

     

    cylinder

     noun
    noun
    NAmE//ˈsɪləndər//
     
     
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  1. 1a 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
  3. 3the hollow tube in an engine, shaped like a cylinder, inside which the piston moves a six-cylinder engine
  4. Idioms
    working/firing on all cylinders(informal)
     
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    using all your energy to do something; working as well as possible
See the Oxford Advanced Learner's Dictionary entry: cylinder