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WordReference Random House Unabridged Dictionary of American English © 2024con′ic sec′tion, [Geom.]- Mathematicsa curve formed by the intersection of a plane with a right circular cone;
an ellipse, a circle, a parabola, or a hyperbola. Also called conic.
Collins Concise English Dictionary © HarperCollins Publishers:: conic section n - one of a group of curves formed by the intersection of a plane and a right circular cone. It is either a circle, ellipse, parabola, or hyperbola, depending on the eccentricity, e, which is constant for a particular curve e = 0 for a circle; e<1 for an ellipse; e = 1 for a parabola; e>1 for a hyperbola
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