Quadric

(a.) Of or pertaining to the second degree.

Quadric - Other Definitions

(a.) Of or pertaining to the second degree.
(n.) A quantic of the second degree. See Quantic.
(n.) A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics.