1. A curve generated by any point in the plane of a movable circle, which rolls on the inside or outside of the circumference of a fixed circle.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• epicyclid,
• wpicycloid,
• spicycloid,
• dpicycloid,
• rpicycloid,
• 4picycloid,
• 3picycloid,
• epicycloide,
• epicyloid,
• epicycoid,
• epicicloid,
• epicycloyd,
• Epicicyloid,
• Epicycloed,
• Epikicloid,
• Epiciclid,
• Epycyloid,
• Epicycleid,
• Epicyclyd,
• Epicicloide

• epicycle,
• epicyclic,
• epicyclical.

The adjective form of the word "epicycloid" is "epicycloidal".

The plural of the "epicycloid" can be the "epicycloids".

The singular of the "epicycloid" can be the "epicycloid".