cylinder UK /ˈsɪlɪndə(ɹ)/US /ˈsɪləndɚ/noun 9verb 1forms 3 noun9 •A surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.When the two-dimensional curve is a circle, the cylinder is called a circular cylinder. When the axis is perpendicular to the plane of the curve, the cylinder is called a right cylinder. In non-mathematical usage, both right and circular are usually implied. •Any object in the form of a circular cylinder.A big greyish rounded bulk, the size, perhaps, of a bear, was rising slowly and painfully out of the cylinder. — 1898 •A container in the form of a cylinder with rounded ends for storing pressurized gas; a gas cylinder. •The part of a revolver that contains chambers for the cartridges. •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 solid figure bounded by a cylinder and two parallel planes intersecting the cylinder. •An early form of phonograph recording, made on a wax cylinder. •The corresponding tracks on a vertical arrangement of disks in a disk drive considered as a unit of data capacity. verb1 •To calender; to press (paper, etc.) between rollers to make it glossy. formscylindered · cylindering · cylinders
