Quadric \Quad"ric\, n.
   (a) (Alg.) A quantic of the second degree. See Quantic.
   (b) (Geom.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Quadric \Quad"ric\, a. (Math.) Of or pertaining to the second degree.

Source: Webster's Revised Unabridged Dictionary (1913)