A drawing of a cylinder showing the height at the center.



  • A surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.
  • A solid figure bounded by a cylinder and two parallel planes intersecting the cylinder.
  • Any object in the form of a circular cylinder.
  • A cylindrical cavity or chamber in a mechanism, such as the counterpart to a piston found in a piston-driven engine.
  • The space in which a piston travels inside a reciprocating engine or pump.
  • A container in the form of a cylinder with rounded ends for storing pressurized gas; a gas cylinder.
  • An early form of phonograph recording, made on a wax cylinder.
  • The part of a revolver that contains chambers for the cartridges.
  • The corresponding tracks on a vertical arrangement of disks in a disk drive considered as a unit of data capacity.


  • To calender; to press (paper, etc.) between rollers to make it glossy.


  • From Middle French chilindre, cylindre, from Latin cylindrus, from Ancient Greek κύλινδρος, from κυλίνδω "I roll or wallow" (intransitive). calender.

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