Cylinder

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Template:Wiktionarypar The word cylinder has several meanings:

Cylinder (algebra), the cartesian product of a set with its superset
Cylinder (geometry), a three-dimensional geometric surface
Cylinder (engine), the space within which a piston travels in an engine
Cylinder (disk drive), a unit of data division on a hard disk drive
Gas cylinder, containers used to store compressed gases or compressed air
Graduated cylinder, glassware used for measurement of liquids in laboratories
Phonograph cylinder, the dominant medium of audio storage from the 1870s to the 1910s and in limited use (such as in the dictaphone) through the mid 20th century
Cylinder (firearms), the cylinder is the rotating device that contains the firing chambers of a revolver
A type of lens and a form of refraction error.