epicycloid

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noun

The locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.

Similar
hypocycloid
OriginEnglish cycloid ← Ancient Greek ἐπῐ- (epĭ-) ← Proto-Hellenic *epí →
Scrabble 20
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Meanings

nounepicycloid (plural epicycloids)

plural epicycloids

  1. geometryThe locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.

    Synonyms: hypocycloid

Synonyms & antonyms

nounThe locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.

Similar
hypocycloid
Also see
hypocycloid

Origin

  1. Proto-Indo-European*h₁ep-
  2. Proto-Indo-European*h₁éps
  3. Proto-Indo-European*h₁épi
  4. Proto-Hellenic*epí
  5. Ancient Greekἐπί (epí)
  6. Ancient Greekἐπῐ- (epĭ-)
  7. Englishepi-
  8. Englishcycloid
  9. Englishepicycloid

From epi- (“above or outside”) + cycloid.

Full word history & related roots →

Translations

Afrikaans episikloïed
  • episikloïedlocus
Czech epicykloida
  • epicykloidalocus
Finnish episykloidi
  • episykloidilocus
French épicycloïde
  • épicycloïdelocus
German Epizykloide
  • Epizykloidelocus
Italian epicicloide
  • epicicloidelocus
Polish epicykloida
  • epicykloidalocus
Portuguese epicicloide
  • epicicloidelocus
Romanian epicicloidă
  • epicicloidălocus
Russian эпицикло́ида
  • эпицикло́ида (epiciklóida)locus
Spanish epicicloide
  • epicicloidelocus
Cite this entry
APA

epicycloid. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/epicycloid

MLA

“epicycloid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/epicycloid. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “epicycloid,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/epicycloid.

Source: epicycloid on Wiktionary, CC BY-SA 4.0.