D defs.my
Entry 1 sense Webster, 1913

Epicycloidal

· Ep·i·cy·cloid·al · IPA
01 a. Pertaining to the epicycloid, or having its properties.
  1. 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.