from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle.

from the GNU version of the Collaborative International Dictionary of English

  • n. A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See hypocycloid, epicycloid, and trochoid.

from The Century Dictionary and Cyclopedia

  • n. A curve which can be traced by a point rigidly connected with a circle which rolls upon the interior of another circle.


hypo- +‎ trochoid (Wiktionary)



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