is a figure expressed by the equation $xy^2 = a$, having two asymptotes, and consisting of two hyperbolas, lying in the adjoining angles of the asymptotes, and not in the opposite angles, like the Apollonian hyperbola; being otherwise called by Newton, in his Enumeratio Linearum Tertii Ordinis, an hyperbolismus of a parabola; and is the 6th species of those lines according to him.

Conic Parabola, a curve of the second order, having two infinite legs tending contrary ways. The curve of this parabula cannot be rectified even by means of the conic sections.