PARABOLAE

Noun

parabolae

(rare) plural of parabola

Source: Wiktionary

PARABOLA

Pa*rab"o*la, n.; pl. Parabolas. Etym: [NL., fr. Gr. 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 = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes.

Source: Webster’s Unabridged Dictionary 1913 Edition