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The Collaborative International Dictionary of English v.0.48 (gcide)

Epicycle \Ep"i*cy`cle\, n. [L. epicyclus, Gr. ?; 'epi` upon ?
circle. See {Cycle}.]
1. (Ptolemaic Astron.) A circle, whose center moves round in
the circumference of a greater circle; or a small circle,
whose center, being fixed in the deferent of a planet, is
carried along with the deferent, and yet, by its own
peculiar motion, carries the body of the planet fastened
to it round its proper center.
[1913 Webster]

The schoolmen were like astronomers which did feign
eccentrics, and epicycles, and such engines of orbs.
--Bacon.
[1913 Webster]

2. (Mech.) A circle which rolls on the circumference of
another circle, either externally or internally.
[1913 Webster] epicyclic

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