Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of epicycloid is as below...

Epicycloid :: Epicycloid (n.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle.

Trochoid :: Trochoid (n.) The curve described by any point in a wheel rolling on a line; a cycloid; a roulette; in general, the curve described by any point fixedly connected with a moving curve while the moving curve rolls without slipping on a second fixed curve, the curves all being in one plane. Cycloids, epicycloids, hypocycloids, cardioids, etc., are all trochoids..

Hypocycloid :: Hypocycloid (n.) A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf. Epicycloid, and Trochoid..

Hypotrochoid :: Hypotrochoid (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..

Epicycloidal :: Epicycloidal (a.) Pertaining to the epicycloid, or having its properties..

Epitrochoid :: Epitrochoid (n.) A kind of curve. See Epicycloid, any Trochoid..

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