<p><strong>Noun:</strong></p><ul><li>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</li><li>any cylinderlike object or part, whether solid or hollow</li><li>the rotating part of a revolver, containing the chambers for the cartridges</li><li>(in a pump) a cylindrical chamber in which a piston slides to move or compress a fluid</li><li>(in an engine) a cylindrical chamber in which the pressure of a gas or liquid moves a sliding piston</li><li>(in certain printing presses) a rotating cylinder that produces the impression and under which a flat form to be printed from passes</li><li>either of two cylinders, one carrying a curved form or plate to be printed from, that rotate against each other in opposite directions</li><li>(in certain locks) a cylindrical device for retaining the bolt until tumblers have been pushed out of its way</li><li>(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</li><li>(Computers) the tracks of a magnetic disk that are accessible from a single radial position of the access mechanism</li><li>(Textiles) the main roller on a carding machine, especially the roller covered with card clothing that works in combination with the worker and stripper rollers in carding fibers</li><li>(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</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>to furnish with a cylinder or cylinders</li><li>to subject to the action of a cylinder or cylinders</li></ul>