cylindrical

{ } a. [ Gr. kylindriko`s, from ky`lindros cylinder: cf. F. cylindrique. ] Having the form of a cylinder, or of a section of its convex surface; partaking of the properties of the cylinder. [ 1913 Webster ]

Cylindrical lens, a lens having one, or more than one, cylindrical surface. --
Cylindric surface or
Cylindrical surface, (Geom.), a surface described by a straight line that moves according to any law, but so as to be constantly parallel to a given line. --
Cylindrical vault. (Arch.) See under Vault, n. [ 1913 Webster ]

n. 1. the roundness of a 3-dimensional cylinder.
Syn. -- cylindricalness; cylindricity. [ WordNet 1.5 ]