| 单词 | epicycle |
| 释义 | epicycle —epicyclic /ep'euh suy"klik, -sik"lik/, adj. /ep"euh suy'keuhl/, n. 1. Astron. a small circle the center of which moves around in the circumference of a larger circle: used in Ptolemaic astronomy to account for observed periodic irregularities in planetary motions. 2. Math. a circle that rolls, externally or internally, without slipping, on another circle, generating an epicycloid or hypocycloid. [1350-1400; ME < MF < LL epicyclus < Gk epíkyklos. See EPI-, CYCLE] |
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