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cycloid

[sahy-kloid] /ˈsaɪ klɔɪd/
adjective
1.
resembling a circle; circular.
2.
(of the scale of a fish) smooth-edged, more or less circular in form, and having concentric striations.
3.
(of a fish) having such scales.
4.
Psychiatry. of or noting a personality type characterized by wide fluctuation in mood within the normal range.
noun
5.
a cycloid fish.
6.
Geometry. a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line.
Origin
1655-1665
1655-65; < Greek kykloeidḗs like a circle. See cycl-, -oid
Related forms
cycloidal, adjective
cycloidally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cycloidal

cycloid

/ˈsaɪklɔɪd/
adjective
1.
resembling a circle
2.
(of fish scales) rounded, thin, and smooth-edged, as those of the salmon
3.
(psychiatry) (of a type of personality) characterized by exaggerated swings of mood between elation and depression See also cyclothymia
noun
4.
(geometry) the curve described by a point on the circumference of a circle as the circle rolls along a straight line Compare trochoid (sense 1)
5.
a fish that has cycloid scales
Derived Forms
cycloidal, adjective
cycloidally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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cycloidal in Science
cycloid
  (sī'kloid')   

  1. Resembling a circle.

  2. Thin, rounded, and smooth-edged, like a disk. Used of fish scales.

  3. The curve traced by a point on the circumference of a circle that rolls on a straight line.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for cycloidal

cycloid

the curve generated by a point on the circumference of a circle that rolls along a straight line. If r is the radius of the circle and theta (theta) is the angular displacement of the circle, then the polar equations of the curve are x = r(theta - sin theta) and y = r(1 - cos theta)

Learn more about cycloid with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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