Meaning of epicycloid

ep•i•cy•cloid

Pronunciation: (ep"u-sī'kloid), [key]
— n. Geom.
  1. a curve generated by the motion of a point on the circumference of a circle that rolls externally, without slipping, on a fixed circle. Equation:= (a + b) cos &thgr; − b cos [(a + b)&thgr;/b] and y = (a + b) sin &thgr; − b sin [(a + b)&thgr;/b]. Cf. epitrochoid. x
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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