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Webster 1913 Edition

Limacon

‖

Liˊmaˊçon′

(lē̍ˊmȧˊsôN′)

,

Noun.

[F.

limaçon

, lit., a snail.]

(Geom.)

A curve of the fourth degree, invented by Pascal. Its polar equation is

r = a cos θ + b

.