cylinder
ruled surface spanned by a one-parameter family of parallel lines
parabolic cylinder
type of cylinder; imaginary elliptic cylinder; cylinder whose cross section is an parabola
open cylinder
does not include either top or bottom elements, and therefore has surface area (lateral area) L = 2πrh
elliptic cylinder
quadric surface; cylinder whose cross section is an ellipse
circular cylinder
type of cylinder; ordinary cylinder, special case of elliptic cylinder
hyperbolic cylinder
type of cylinder; imaginary elliptic cylinders; cylinder whose cross section is an hyperbola