cycloid

noun
cy·​cloid | \ ˈsī-ˌklȯid How to pronounce cycloid (audio) \

Definition of cycloid

 (Entry 1 of 2)

: a curve that is generated by a point on the circumference of a circle as it rolls along a straight line

cycloid

adjective

Definition of cycloid (Entry 2 of 2)

1 : smooth with concentric lines of growth cycloid scales also : having or consisting of cycloid scales
2 : characterized by alternating high and low moods a cycloid personality

Illustration of cycloid

Illustration of cycloid

Noun

In the meaning defined above

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Other Words from cycloid

Noun

cycloidal \ sī-​ˈklȯi-​dᵊl How to pronounce cycloid (audio) \ adjective

Examples of cycloid in a Sentence

Recent Examples on the Web: Noun The model on display in the Museo Galileo allows one to test this result by building two tracks: one shaped like a cycloid, the other shaped like the arc of a circle, for comparison. Jennifer Ouellette, Ars Technica, 17 May 2020 The solution is a cycloid, which is the curve created by a rolling wheel in a circle. Jennifer Ouellette, Ars Technica, 17 May 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cycloid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of cycloid

Noun

1661, in the meaning defined above

Adjective

1847, in the meaning defined at sense 1

History and Etymology for cycloid

Noun

French cycloïde, from Greek kykloeidēs circular, from kyklos

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Time Traveler for cycloid

Time Traveler

The first known use of cycloid was in 1661

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Cite this Entry

“Cycloid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cycloid. Accessed 23 Jun. 2021.

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More Definitions for cycloid

cycloid

noun
cy·​cloid | \ ˈsī-ˌklȯid How to pronounce cycloid (audio) \

Medical Definition of cycloid

 (Entry 1 of 2)

: a cycloid individual

cycloid

adjective

Medical Definition of cycloid (Entry 2 of 2)

: relating to, having, or being a personality characterized by alternating high and low moods — compare cyclothymic

More from Merriam-Webster on cycloid

Britannica.com: Encyclopedia article about cycloid

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