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pa·rab·o·la /pəˈræbələ/

拋物線

parabola

拋物線

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*n* is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n =

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From: WordNet (r) 2.0

parabola

n : a plane curve formed by the intersection of a right circular

cone and a plane parallel to an element of the curve