Quadric is a 7 letter English word. It's valid Scrabble word worth 19 points. It's valid Words with friends word worth 21 points.
You can make 126 anagrams from letters in quadric (acdiqru).
First recorded in 1855-60; quadr- + -ic
Every line which has three points in common with a quadric surface lies on the surface.
Each ray cuts its corresponding plane in a point, the locus of these points is a quadric surface.
Evidently the method gives for L a quadric equation, which is the “resolvent” equation in this particular case.
Instead of a circle or sphere we may take any conic or quadric.
On a quadric surface the points are all hyperbolic, or all parabolic, or all elliptic.
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.
Every plane section of a quadric surface is a conic or a line-pair.
Now from a quadric equation we derive, in like manner, the notion of a complex or imaginary number such as is spoken of above.
This plane is called the polar plane of the point P, with regard to the quadric surface.
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