epicycloid
epi·cy·cloid
noun \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
— epi·cy·cloi·dal \-sī-ˈklȯi-dəl\ adjective
Illustration of EPICYCLOID
First Known Use of EPICYCLOID
circa 1755
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