cycloid

English

Etymology

cyclo- +‎ -oid

Pronunciation

• IPA^(key): /ˈsaɪklɔɪd/

Noun

cycloid (plural cycloids)

1. (geometry) The locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line.
   • 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:

     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.

2. (zoology) A fish having cycloid scales.

Translations

geometry: locus of a point on the circumference of a rolling circle

• Catalan: cicloide f
• Czech: cykloida f
• Dutch: cycloïde (nl) f
• Esperanto: cikloido
• French: cycloïde (fr) f
• German: Zykloide f, Radlaufkurve f
• Greek: κυκλοειδής (el) m or f (kykloeidís)
• Hungarian: ciklois (hu)
• Irish: cioglóideach m, ciorclóideach m
• Italian: cicloide f
• Occitan: cicloïde f
• Polish: cykloida (pl) f
• Portuguese: cicloide f
• Romanian: cicloidă (ro) f
• Russian: цикло́ида (ru) f (ciklóida)
• Serbo-Croatian:

  Cyrillic: циклои́да f

  Roman: cikloída (sh) f

• Spanish: cicloide f

zoology: fish with cycloid scales

Adjective

cycloid (not comparable)

1. Resembling a circle; cycloidal.
2. (zoology, of fish scales) Thin and rounded, with smooth edges.
3. (psychoanalysis) characterized by alternating high and low moods.

Translations

resembling a circle

• French: cycloïdal (fr)
• Greek: κυκλοειδής (el) (kykloeidís)
• Irish: cioglóideach, ciorclóideach
• Portuguese: cicloide

fish scales: thin and rounded

• French: cycloïde (fr)

Derived terms

• cycloidal
• cycloidal arch
• cycloidal engine

Related terms

• epicycloid
• hypocycloid

See also

• Spirograph™