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:
r ^{2} = 2
a ^{2} cosθ.
Origin: 1775–85; <
Latin lēmniscātus adorned with ribbons. See
lemniscus,
-ate^{1}