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Webster 1913 Edition
Quadric
Quad′ric
,Adj.
(Math.)
Of or pertaining to the second degree.
Quad′ric
,Noun.
(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.