epicycle

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See also: épicycle

English[edit]

Etymology[edit]

From Latin epicyclus, from Ancient Greek ἐπίκυκλος(epíkuklos), from ἐπί(epí, upon) + κύκλος(kúklos, circle).

Pronunciation[edit]

Noun[edit]

epicycle ‎(plural epicycles)

  1. (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.
  2. (mathematics) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.

Derived terms[edit]

Translations[edit]

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