What is the meaning of 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.
Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
A ring of atoms joining parts of an already cyclic compound
An ad hoc complication added to a model to make it fit the known data
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