Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A plane curve with polar equation or , of which the cardioid is a special case.

from the GNU version of the Collaborative International Dictionary of English

  • n. A curve of the fourth degree, invented by Pascal. Its polar equation is r = a cos θ + b.

from The Century Dictionary and Cyclopedia

  • n. Any univalve shell.
  • n. A curve, invented and named by Pascal, generated from a circle by adding a constant length to all the radii vectores drawn from a point of its circumference as an origin, taking proper account of negative radii vectores.

Etymologies

From French limaçon, ultimately from Latin limax ("snail"). (Wiktionary)

Examples

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