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epitrochoid

[ep-i-troh-koid] /ˌɛp ɪˈtroʊ kɔɪd/
Geometry
1.
a plane curve generated by the motion of a fixed point on the radius or extension of the radius of a circle that rolls externally, without slipping, on a fixed circle. The epitrochoid is a generalization of the epicycloid.
Origin
1835-1845
1835-45; epi- + trochoid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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