Definiciones
1.NounA 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.
2.NounAny circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
3.NounA ring of atoms joining parts of an already cyclic compound
4.NounAn ad hoc complication added to a model to make it fit the known data