Definition of paraboloids:
(n) :
(mathematics) Short for elliptic paraboloid [(mathematics) A surface having parabolic cross sections parallel to an axis and elliptical cross sections perpendicular to the axis; especially the surface of revolution of a parabola.]
(n) :
(mathematics) Short for hyperbolic paraboloid [(mathematics) A surface having parabolic cross sections parallel to an axis and hyperbolic cross sections perpendicular to the axis.]