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Meaning of hypocycloid

hy•po•cy•cloid

Pronunciation: (hī"pu-sī'kloid), [key]
— n. Geom.
  1. a curve generated by the motion of a point on the circumference of a circle that rolls internally, without slipping, on a given circle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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