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quadric a. 二次的
n. 二次曲面 二次的二次曲面 quadric 二次的; 二次曲面的 quadric 二次 二次曲面 quadric n 1: a curve or surface whose equation (in Cartesian coordinates) is of the second degree [synonym: {quadric}, {quadric surface}] Quadric \Quad"ric\, a. (Math.)
Of or pertaining to the second degree. [1913 Webster] 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. [1913 Webster]
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