Epicycloidal
Pronunciation : Ep`i*cy*cloid"al
Part of Speech : a.
Definition : Defn: Pertaining to the epicycloid, or having its properties. Epicycloidal wheel, a device for producing straight-line motion from circular motion, on the principle that a pin fastened in the periphery of a gear wheel will describe a straight line when the wheel rolls around inside a fixed internal gear of twice its diameter.
Source : Webster's Unabridged Dictionary, 1913