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parabola 音标拼音: [pɚ'æbələ] n. 抛物线 抛物线 parabola抛物线 parabola n 1: a plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curveParabola \ Pa* rab" o* la\, n.; pl. { Parabolas}. [ NL., fr. Gr. ?; -- so called because its axis is parallel to the side of the cone. See { Parable}, and cf. { Parabole}.] ( 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} where n is a positive whole number or a positive fraction. For the { cubical parabola} n = 3; for the { semicubical parabola} n = 3/ 2. See under { Cubical}, and { Semicubical}. The parabolas have infinite branches, but no rectilineal asymptotes. [ 1913 Webster] 18 Moby Thesaurus words for " parabola": arc, bow, catacaustic, catenary, caustic, circle, conchoid, crook, curl, curve, diacaustic, ellipse, festoon, hook, hyperbola, lituus, sinus, tracery
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