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noun
1.
a three-dimensional surface whose equation is a quadratic equation.
1880-1885
First recorded in 1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for quadric surface
Historical Examples
• Every plane section of a quadric surface is a conic or a line-pair.

• 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.

• Every conic which has five points in common with a quadric surface lies on the surface.

• Every plane which cuts a quadric surface in a line-pair is a tangent plane.

• These are called chief-tangent curves; on a quadric surface they are the above straight lines.