witch of Agnesi

noun Geometry.
a plane curve symmetrical about the y- axis and asymptotic to the x- axis, given by the equation x 2 y =4 a 2 (2 ay ).
Also called versiera.

1870–75; named after Maria Gaetana Agnesi (1718–99), Italian mathematician and philosopher

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World English Dictionary
witch of Agnesi (ɑːnˈjeɪzɪ)
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]

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American Heritage
Science Dictionary
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 x2y = 4a2(2a - y), where a is a constant.
The American Heritage® Science Dictionary
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