Cylindric Cy*lin"dric (s?-l?n"dr?k), Cylindrical Cy*lin"dric*al (-dr?-kal), 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. Cylindrical lens, a lens having one, or more than one, cylindrical surface. Cylindric, 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.