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limaçon

[lim-uh-son] /ˈlɪm əˌsɒn/
noun, Geometry
1.
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.
Origin
1575-1585
1575-85; < French: literally, snail, Old French, derivative of limaz < Latin līmācem, accusative of līmāx snail, slug
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for limacon

limaçon

/ˈlɪməˌsɒn/
noun
1.
a heart-shaped curve generated by a point lying on a line at a fixed distance from the intersection of the line with a fixed circle, the line rotating about a point on the circumference of the circle
Word Origin
French, literally: snail (so named by Pascal)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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