Epicycloidal /(?)/

Ep·i·cy·cloid·al

Epicycloidal

a.
  1. Pertaining to the epicycloid, or having its properties.

Phrases & Compounds
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.