epicycle -
a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
circle any circular or rotating mechanism; "the machine punched out metal circles"
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Wiktionary
Substantiv
epicycle -
A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the "seven planets", given a fixed central Earth.
epicycle -
Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
