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
Origin of epicycle
Middle English epicicle, from Late Latin epicyclus, from Greek epikyklos, from epi- + kyklos circle — more at wheel
First Known Use: 14th century
Learn More about epicycle
Britannica.com: Encyclopedia article about "epicycle"
Seen and Heard
What made you want to look up epicycle? Please tell us where you read or heard it (including the quote, if possible).