Pronunciation: (lim'u-son"), [key]
a plane curve generated by the locus of a point on a line at a fixed distance from the point of intersection of the line with a fixed circle, as the line revolves about a point on the circumference of the circle. Equation: r = a cosθ + b. Also called Pascal's limaçon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.