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epicycle Twit Definition of epicycle Share Definition of epicycle on Facebook Digg:Definition of epicycle! stumble Definition of epicycle Bookmark Definition of epicycle on Delicious submit Definition of epicycle to reddit Bookmark Definition of epicycle
noun 
  1. (astronomy) (in Ptolemaic cosmology) a small circle, moving around the circumference of a larger circle having the earth at its centre; the supposed orbit of a planet
  2. (mathematics) any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid
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