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WORDNET DICTIONARY
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# epicycloid

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Noun
:
ep=i=cy=cloid

## CIDE DICTIONARY

epicycloidn. [Epicycle + -oid: cf. F. épicycloïde.].
A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle.  [1913 Webster]
" 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."  [1913 Webster]

## OXFORD DICTIONARY

epicycloid, n. Math. a curve traced by a point on the circumference of a circle rolling on the exterior of another circle.

Derivative