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[kwod-rik] /ˈkwɒd rɪk/ Mathematics
1.
of the second degree (said especially of functions with more than two variables).
noun
2.
3.
a surface such as an ellipsoid or paraboloid as defined by a second-degree equation in three real variables.
1855-1860
First recorded in 1855-60; quadr- + -ic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for quadric
Historical Examples
• Every plane section of a quadric surface is a conic or a line-pair.

• Instead of a circle or sphere we may take any conic or quadric.

• Now from a quadric equation we derive, in like manner, the notion of a complex or imaginary number such as is spoken of above.

• Evidently the method gives for L a quadric equation, which is the “resolvent” equation in this particular case.

• Each ray cuts its corresponding plane in a point, the locus of these points is a quadric surface.

• The surface itself is therefore called a quadric surface, or a surface of the second order.

• If through one point on a quadric surface no line on the surface can be drawn, then the surface contains no lines.

• On a quadric surface the points are all hyperbolic, or all parabolic, or all elliptic.

• This plane is called the polar plane of the point P, with regard to the quadric surface.

• Every line which has three points in common with a quadric surface lies on the surface.

/ˈkwɒdrɪk/
1.
having or characterized by an equation of the second degree, usually in two or three variables
2.
of the second degree
noun
3.
a quadric curve, surface, or function
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition