cycloid
Americanadjective
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resembling a circle; circular.
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(of the scale of a fish) smooth-edged, more or less circular in form, and having concentric striations.
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(of a fish) having such scales.
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Psychiatry. of or noting a personality type characterized by wide fluctuation in mood within the normal range.
noun
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a cycloid fish.
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Geometry. a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line.
adjective
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resembling a circle
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(of fish scales) rounded, thin, and smooth-edged, as those of the salmon
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psychiatry (of a type of personality) characterized by exaggerated swings of mood between elation and depression See also cyclothymia
noun
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geometry the curve described by a point on the circumference of a circle as the circle rolls along a straight line Compare trochoid
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a fish that has cycloid scales
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Resembling a circle.
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Thin, rounded, and smooth-edged, like a disk. Used of fish scales.
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The curve traced by a point on the circumference of a circle that rolls on a straight line.
Other Word Forms
Etymology
Origin of cycloid
First recorded in 1655–65, cycloid is from the Greek word kykloeidḗs like a circle. See cycl-, -oid
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Kahn played with natural light in the Fort Worth building, suffused with skylights, reflectors and cycloid barrel vaults.
From New York Times ● May 4, 2022
Use Green’s theorem to find the area under one arch of the cycloid given by parametric plane x = t − sin t, y = 1 − cos t, t ≥ 0.
From Textbooks ● Mar. 30, 2016
Figure 7.9 A wheel traveling along a road without slipping; the point on the edge of the wheel traces out a cycloid.
From Textbooks ● Mar. 30, 2016
Figure 1.9 A wheel traveling along a road without slipping; the point on the edge of the wheel traces out a cycloid.
From Textbooks ● Mar. 30, 2016
It is impossible to mill out even a convex cycloid or epicycloid, by the means and in the manner above described.
From Modern Machine-Shop Practice, Volumes I and II by Joshua Rose
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
