Definitions from Wiktionary (epicycle)

▸ noun:  (astronomy) 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.
▸ noun:  (geometry) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
▸ noun:  (organic chemistry) A ring of atoms joining parts of an already cyclic compound
▸ noun:  (figuratively) An ad hoc complication added to a model to make it fit the known data





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