'Limacon' definitions:

Definition of 'Limacon'

From: GCIDE

Limacon \Li`ma`[,c]on"\ (l[-e]`m[.a]`s[^o]N"), n. [F. lima[,c]on, lit., a snail.] (Geom.) A curve of the fourth degree, invented by Pascal. Its polar equation is r = a cos [theta] + b. [1913 Webster]