(?), 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.
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2. (Mech.) A circle which rolls on the circumference of another circle, either externally or internally.
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(?), a. Pertaining to, resembling, or having the motion of, an epicycle.
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Epicyclic train (Mach.), a train of mechanism in which epicyclic motion is involved; esp., a train of spur wheels, bevel wheels, or belt pulleys, in which an arm, carrying one or more of the wheels, sweeps around a center lying in an axis common to the other wheels.
[1913 Webster]


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