Etymology
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epicycle (n.)

"small circle moving on or around another circle," late 14c., from Late Latin epicyclus, from Greek epikyklos, from epi (see epi-) + kyklos "circle, wheel, circular motion, cycle of events" (from PIE root *kwel- (1) "revolve, move round"). Related: Epicyclic.

updated on April 26, 2017

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Definitions of epicycle from WordNet

epicycle (n.)
a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.