maths Sometimes shortened to: witch a plane curve, symmetrical about the y-axis, having the equation x²y = 4a²(2a--y)
[C19: named after Maria Gaetana Agnesi (1718--99), Italian mathematician and philosopher; probably so called from the resemblance of the curve to the outline of a witch's hat]
witch of Agnesi (wĭch əv än-yā'zē) Pronunciation Key
A planar cubic curve that is symmetric about the y-axis and that approaches the x-axis as an asymptote. Its equation is x^{2}y = 4a^{2}(2a - y), where a is a constant.