quadric

[kwod-rik] Mathematics.
adjective
1.
of the second degree (said especially of functions with more than two variables).
noun
2.
a quadric function.
3.
a surface such as an ellipsoid or paraboloid as defined by a second-degree equation in three real variables.

Origin:
1855–60; quadr- + -ic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quadric (ˈkwɒdrɪk)
 
adj
1.  having or characterized by an equation of the second degree, usually in two or three variables
2.  of the second degree
 
n
3.  a quadric curve, surface, or function

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The lidar data was filtered, as necessary, using a quadric error metric to remove redundant points.
Surfaces, defined by quadric equations are used for a three-dimensional description of the physical configuration.
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