epicycloid

noun
epi·​cy·​cloid | \ˌe-pə-ˈsī-ˌklȯid \

Definition of epicycloid 

: a curve traced by a point on a circle that rolls on the outside of a fixed circle

Illustration of epicycloid

Illustration of epicycloid

epicycloid E, traced by point P, on circle R, rolling on fixed circle F

Other Words from epicycloid

epicycloidal \ ˌe-​pə-​sī-​ˈklȯi-​dᵊl \ adjective

First Known Use of epicycloid

circa 1696, in the meaning defined above

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The first known use of epicycloid was circa 1696

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