- a curve, either an ellipse, circle, parabola, or hyperbola, produced by the intersection of a plane with a right circular cone
- [pl., with sing. v.] the branch of geometry dealing with ellipses, circles, parabolas, and hyperbolasalso con′ics
conic sectionconic section
- 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.
- A graph of the general quadratic equation in two variables.