# witch of Agnesi

[ah-nyey-zee]

- a plane curve symmetrical about the y-axis and asymptotic to the x-axis, given by the equation x2y=4a2(2a−y).

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## Origin of witch of Agnesi^{}

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

Also called versiera.

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## witch of Agnesi

- maths a plane curve, symmetrical about the y- axis, having the equation x ² y = 4 a ²(2 a – y)Sometimes shortened to: witch

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## Word Origin

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## witch of Agnesi

[wĭch əv än-yā′zē]

- 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.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.