A curve, either an ellipse, circle, parabola, or hyperbola, produced by the intersection of a plane with a right circular cone.

noun

The intersection of a right circular cone and a plane, which generates one of a group of plane curves, including the circle, ellipse, hyperbola, and parabola.

noun

A graph of the general quadratic equation in two variables.

noun

The branch of geometry dealing with ellipses, circles, parabolas, and hyperbolas.

noun

A curve formed by the intersection of a plane with a cone. Conic sections can appear as circles, ellipses, hyperbolas, or parabolas, depending on the angle of the intersecting plane relative to the cone's base.

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Singular:

conic-section
Plural:

conic-sections