lemniscate

[ lem-nis-kit, lem-nis-keyt, -kit ]
/ lɛmˈnɪs kɪt, ˈlɛm nɪsˌkeɪt, -kɪt /

noun Analytic Geometry.

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: r2 = 2a2cosθ.
Also called Bernoulli's lemniscate.

Origin of lemniscate

First recorded in 1775–85, lemniscate is from the Latin word lēmniscātus adorned with ribbons. See lemniscus, -ate1

British Dictionary definitions for lemniscate

lemniscate
/ (ˈlɛmnɪskɪt) /

noun

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