plural of epicycloid

(geometry) The locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.

Of or pertaining to an epicycloid.

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.

plural of epicycloidal wheel