quadric

Of or relating to geometric surfaces that are defined by quadratic equations.

In algebra, a homogeneous expression of the second degree in the variables.

In algebra and geometry, of the second degree; quadratic.

Of or pertaining to the second degree.

A quantic of the second degree. See quantic.

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.

A surface whose shape is defined in terms of a quadratic equation

a curve or surface whose equation (in Cartesian coordinates) is of the second degree