Illustration of epicycloid
- epicycloid E
- traced by point P
- on circle R
- rolling on fixed circle F
epicycloid
noun
epi·cy·cloid ˌe-pə-ˈsī-ˌklȯid 
: a curve traced by a point on a circle that rolls on the outside of a fixed circle
epicycloidal
ˌe-pə-sī-ˈklȯi-dᵊl
adjective 
Word History
First Known Use
circa 1696, in the meaning defined above
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- preincarnate
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