parabola

- noun one of the conic sections, a curve formed by the
__intersection__of a cone with a plane parallel to its side

- One of the
**conic sections**. Parabolic sections have the property of being able to bring light to a focus at a single point, so that telescope makers aspire to create parabolic optical surfaces.

- A curve which is formed by a conic section whose distance from a fixed
__point__, called focus, is the same as that to a fixed line, called directrix. The curve obtained when a quadratic equation is graphed is in the shape of a parabola.

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