epicycle

See also: épicycle

English

Etymology

From (deprecated template usage) [etyl] Latin epicyclus, from (deprecated template usage) [etyl] Ancient Greek ἐπίκυκλος (epíkuklos), from ἐπί (epí, “upon”) + κύκλος (kúklos, “circle”).

Pronunciation

• IPA^(key): /ˈɛpɪˌsaɪkəl/

Noun

epicycle (plural epicycles)

1. (astronomy) A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the "seven planets", given a fixed central Earth.
   • Template:RQ:Flr Mntgn Essays, Folio Society, 2006, vol.1, p.155:

     Is it not [Philosophie], that […] teacheth miserie, famine and sicknesse to laugh? Not by reason of some imaginarie Epicicles, but by naturall and palpable reasons.

2. (mathematics) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.
3. (organic chemistry) A ring of atoms joining parts of an already cyclic compound

Derived terms

• epicyclic

Translations

a small circle whose centre is on the circumference of a larger circle

• Bulgarian: епицикъл (epicikǎl)
• Catalan: epicicle
• Czech: epicykl m
• Danish: epicykel
• Dutch: epicykels
• Finnish: episykli
• French: épicycle (fr)
• German: Epizykel
• Hebrew: אפיציקל
• Icelandic: aukahringur m, hjáhringur m
• Ido: epiciklo (io)
• (deprecated template usage) {{trans-mid}}
• Italian: epiciclo (it)
• Kabuverdianu: episiklu, epiciclo
• Malayalam: അധിചക്രം (adhicakraṁ)
• Manx: far-chiarkyl m
• Middle Persian: [script needed] (ywg /⁠ǰuγ⁠/)
• Norwegian: episyklus
• Persian: تدویر (fa) (tadvīr), فلک تدویر (fa) (falak e tadvīr)
• Portuguese: epiciclo m
• Russian: эпицикл (ru) (epicikl)
• Slovak: epicyklus
• Spanish: epiciclo m
• Swedish: epicykel

any circle whose circumference rolls around that of another circle

• Finnish: episykli
• (deprecated template usage) {{trans-mid}}
• Manx: far-chiarkyl m

The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

Translations to be checked

• (deprecated template usage) Swedish: epicykel c
• (deprecated template usage) {{trans-mid}}