词源 |
epicycle n."small circle moving on or around another circle," late 14c., from Late Latin epicyclus, from Greek epikyklos, from epi (see epi-) + kyklos "circle, wheel, circular motion, cycle of events" (from PIE root *kwel- (1) "revolve, move round"). Related: Epicyclic. updated on April 26, 2017 |