epicycle

noun
epi·​cy·​cle | \ˈe-pə-ˌsī-kəl \

Definition of epicycle 

1 in Ptolemaic astronomy : a circle in which a planet moves and which has a center that is itself carried around at the same time on the circumference of a larger circle

2 : a process going on within a larger one

Other Words from epicycle

epicyclic \ˌe-​pə-​ˈsī-​klik, -​ˈsi-​klik \ adjective

First Known Use of epicycle

14th century, in the meaning defined at sense 1

History and Etymology for epicycle

Middle English epicicle, from Late Latin epicyclus, from Greek epikyklos, from epi- + kyklos circle — more at wheel

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The first known use of epicycle was in the 14th century

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