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more about epicycloid
## epicycloid |

2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Epicycloid \Ep`i*cy"cloid\, n. [Epicycle + -oid: cf F. ['e]picyclo["i]de.] (Geom.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle. Note: Any point rigidly connected with the rolling circle, but not in its circumference, traces a curve called an epitrochoid. The curve traced by a point in the circumference of the rolling circle when it rolls on the concave side of a fixed circle is called a hypocycloid; the curve traced by a point rigidly connected with the rolling circle in this case, but not its circumference, is called a hypotrochoid. All the curves mentioned above belong to the class class called roulettes or trochoids. See {Trochoid}. From WordNet r 1.6 [wn]: epicycloid n : a line generated by a point on a circle rolling around another circle

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