Pa·rab·o·la n.; pl. Parabolas Geom. (a) A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus. (b) One of a group of curves defined by the equation y = ax
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Sem·i·cu·bic·al a. Math. Of or pertaining to the square root of the cube of a quantity.
Semicubical parabola, a curve in which the ordinates are proportional to the square roots of the cubes of the abscissas.
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