Geometry . a surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes.

any cylinderlike object or part, whether solid or hollow.

the rotating part of a revolver, containing the chambers for the cartridges.

(in a pump) a cylindrical chamber in which a piston slides to move or compress a fluid.

(in an engine) a cylindrical chamber in which the pressure of a gas or liquid moves a sliding piston.

(in certain printing presses)

a rotating cylinder that produces the impression and under which a flat form to be printed from passes.

either of two cylinders, one carrying a curved form or plate to be printed from, that rotate against each other in opposite directions.

(in certain locks) a cylindrical device for retaining the bolt until tumblers have been pushed out of its way.

(in a screw or cylindrical gear) an imaginary cylindrical form, concentric to the axis, defining the pitch or the inner or outer ends of the threads or teeth.

Computers . the tracks of a magnetic disk that are accessible from a single radial position of the access mechanism.

Textiles . the main roller on a carding machine, esp. the roller covered with card clothing that works in combination with the worker and stripper rollers in carding fibers.

Archaeology . a cylindrical or somewhat barrel-shaped stone or clay object bearing a cuneiform inscription or a carved design, worn by the Babylonians, Assyrians, and kindred peoples as a seal and amulet.

to furnish with a cylinder or cylinders.

to subject to the action of a cylinder or cylinders.

noun

circular solid , barrel , volumetric curve