- (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.
- (a.) Of or pertaining to the second degree.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). quadric. Retrieved September 21, 2026, from http://smartdefine.org/quadric/definitions/2051545 |
| Chicago | Webster's. 2011. "quadric" http://smartdefine.org/quadric/definitions/2051545 (accessed September 21, 2026). |
| Harvard | Webster's 2011, quadric, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/quadric/definitions/2051545>. |
| MLA | Webster's. "quadric" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/quadric/definitions/2051545> |