cylinder

n. 1 uniform solid or hollow body with straight sides and a circular section. 2 thing of this shape, e.g. A container for liquefied gas, a piston-chamber in an engine.  cylindrical adj. [latin cylindrus from greek]

n. A solid body which may be generated by the rotation of a parallelogram round one its sides; or a body of rollerlike form, of which the longitudinal section is oblong, and the cross section is circular.