
Mathematics The surface generated by a straight line intersecting and moving along a closed plane curve, the directrix, while remaining parallel to a fixed straight line that is not on or parallel to the plane of the directrix.
(noun)

Mathematics The portion of such a surface bounded by two parallel planes and the regions of the planes bounded by the surface.
(noun)

Mathematics A solid bounded by two parallel planes and such a surface, especially such a surface having a circle as its directrix.
(noun)

A cylindrical container or object.
(noun)

Engineering The chamber in which a piston of a reciprocating engine moves.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.