Definitions from Wiktionary (cylinder)

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

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