/ ˈsɪlɪndə(r); NAmE / noun
a solid or hollow figure with round ends and long straight sides
an object shaped like a cylinder, especially one used as a container :
a gas / oxygen cylinder
the hollow tube in an engine, shaped like a cylinder, inside which the piston moves :
a six-cylinder engine
- working / firing on all cylinders
late 16th cent.: from Latin cylindrus , from Greek kulindros roller, from kulindein to roll.