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cylinder /ˈsɪləndɚ/  

  • noun
    plural -ders
    [count] a shape that has straight sides and two circular ends - see picture at geometry
    something that is shaped like a cylinder: such as
    a tube in which a piston of an engine moves
    the part of a gun that turns and that holds the bullets
    the cylinder of a revolver
    on all cylinders
    informal :with the greatest possible amount of effort, power, or speed :at full capacity or speed