cycloid

C3Y4C3L1O1I1D2
/ˈsaɪklɔɪd/

noun

The locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line.

Similar
cycloidalrounded
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Meanings

nouncycloid (plural cycloids)

plural cycloids

  1. geometryThe locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line.

    In the firſt Courſe there was a Shoulder of Mutton, cut into an Æquilateral Triangle, a Piece of Beef into a Rhomboides, and a Pudding into a Cycloid.

    1726 October 28, [Jonathan Swift], “The Humours and Dispositions of the Laputians Described. […]”, in Travels into Several Remote Nations of the World. […] [Gulliver’s Travels], volume II, London: […] Benj[amin] Motte, […], →OCLC, part III (A Voyage to Laputa, Balnibarbi, Glubbdubdribb, Luggnagg, and Japan), page 20
  2. biologyA fish having cycloid scales.
adjectivecycloid (not comparable)
  1. not comparableResembling a circle; cycloidal.
  2. not comparablebiologyThin and rounded, with smooth edges.
  3. not comparablehuman sciencescharacterized by alternating high and low moods.

Synonyms & antonyms

adjectiveresembling a circle

Similar
cycloidalrounded
Also see
cycloidal

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

From cyclo- + -oid.

Full word history & related roots →

Translations

Catalan cicloide
  • cicloidegeometry: locus of a point on the circumference of a rolling circle
Czech cykloida
  • cykloidageometry: locus of a point on the circumference of a rolling circle
Dutch cycloïde
  • cycloïdegeometry: locus of a point on the circumference of a rolling circle
Esperanto cikloido
  • cikloidogeometry: locus of a point on the circumference of a rolling circle
Finnish sykloidi
  • sykloidigeometry: locus of a point on the circumference of a rolling circle
French cycloïde, cycloïdal
  • cycloïdegeometry: locus of a point on the circumference of a rolling circle
  • cycloïdalresembling a circle
  • cycloïdefish scales: thin and rounded
German Zykloide, Radlaufkurve
  • Zykloidegeometry: locus of a point on the circumference of a rolling circle
  • Radlaufkurvegeometry: locus of a point on the circumference of a rolling circle
Greek κυκλοειδής, κυκλοειδής
  • κυκλοειδής (kykloeidís)geometry: locus of a point on the circumference of a rolling circle
  • κυκλοειδής (kykloeidís)resembling a circle
Hungarian ciklois
  • cikloisgeometry: locus of a point on the circumference of a rolling circle
Irish cioglóideach, ciorclóideach
  • cioglóideachgeometry: locus of a point on the circumference of a rolling circle
  • ciorclóideachgeometry: locus of a point on the circumference of a rolling circle
  • cioglóideachresembling a circle
  • ciorclóideachresembling a circle
Italian cicloide
  • cicloidegeometry: locus of a point on the circumference of a rolling circle
Polish cykloida, cykloida
  • cykloidageometry: locus of a point on the circumference of a rolling circle
  • cykloidazoology: fish with cycloid scales
  • cykloidalnyresembling a circle
  • cykloidalnyfish scales: thin and rounded
Portuguese cicloide, cicloide
  • cicloidegeometry: locus of a point on the circumference of a rolling circle
  • cicloideresembling a circle
Romanian cicloidă
  • cicloidăgeometry: locus of a point on the circumference of a rolling circle
Russian цикло́ида
  • цикло́ида (ciklóida)geometry: locus of a point on the circumference of a rolling circle
Spanish cicloide, cicloidal
  • cicloidegeometry: locus of a point on the circumference of a rolling circle
  • cicloidalresembling a circle
  • cicloideoresembling a circle
Cite this entry
APA

cycloid. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/cycloid

MLA

“cycloid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cycloid. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “cycloid,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/cycloid.

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