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lemniscate

[lem-nis-kit, lem-nis-keyt, -kit] /lɛmˈnɪs kɪt, ˈlɛm nɪsˌkeɪt, -kɪt/
noun, Analytic Geometry
1.
a plane curve generated by the locus of the point at which a variable tangent to a rectangular hyperbola intersects a perpendicular from the center to the tangent. Equation: r 2 = 2 a 2 cosθ.
Also called Bernoulli's lemniscate.
Origin
1775-1785
1775-85; < Latin lēmniscātus adorned with ribbons. See lemniscus, -ate1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lemniscate

lemniscate

/ˈlɛmnɪskɪt/
noun
1.
a closed plane curve consisting of two symmetrical loops meeting at a node. Equation: (x² + y²)² = a²(x² – y²), where a is the greatest distance from the curve to the origin. The symbol for infinity (∞) is an example
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
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