Meaning of lemniscate

lem•nis•cate

Pronunciation: (lem-nis'kit, lem'nis-kāt", -kit), [key]
— n. Analyt. Geom.
  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:=2acos&thgr;. Also called r
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.