cylinder

noun

1. 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.”

2. A solid figure bounded by a cylinder and two parallel planes intersecting the cylinder.
3. 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.”

4. A cylindrical cavity or chamber in a mechanism, such as the counterpart to a piston found in a piston-driven engine.
5. The space in which a piston travels inside a reciprocating engine or pump.
6. A container in the form of a cylinder with rounded ends for storing pressurized gas; a gas cylinder.
7. An early form of phonograph recording, made on a wax cylinder.
8. The part of a revolver that contains chambers for the cartridges.
9. The corresponding tracks on a vertical arrangement of disks in a disk drive considered as a unit of data capacity.

verb

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