Noun
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.
One of a group of curves defined by the equation y = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = /. See under Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes.
Source: Webster's dictionaryAccording to the definition of a parabola as a conic section, the boundary of this pink cross-section, EPD, is a parabola. Source: Internet
As stated above in the lead, the focal length of a parabola is the distance between its vertex and focus. Source: Internet
A parabola is a conic section that is tangent to Ω, and a hyperbola is one that crosses Ω twice. Source: Internet
At higher speeds, such as in ballistics, the shape is highly distorted and does not resemble a parabola. Source: Internet
A viewer with perfect 180-degree wide-angle vision will see the whole parabola; in practice this is impossible and only a finite portion of the parabola is captured on the film or retina. Source: Internet
As in all cases in the physical world, the trajectory is always an approximation of a parabola. Source: Internet