epicyclen.
英 'epɪ,saɪk(ə)l | 美 'ɛpə,saɪkl
中文n. [天] 本轮；[数] 周转圆
词根词源
epicycle (n.)"small circle moving on or around another circle," late 14c., from Late Latin epicyclus, from Greek epikyklos, from epi (see epi-) + kyklos (see cycle (n.)). Related: Epicyclic.
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