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cycloid
4 dictionary results for: cycloidal
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
cy·cloid       [sahy-kloid] Pronunciation Key
–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: 1655–65; < Gk kykloeids like a circle. See cycl-, -oid]

—Related forms
cy·cloi·dal, adjective
cy·cloi·dal·ly, adverb
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
cy·cloid       (sī'kloid')  Pronunciation Key 


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adj.  
  1. Resembling a circle.
  2. Zoology
    1. Thin, rounded, and smooth-edged; disklike. Used of fish scales.
    2. Having or composed of such scales.
  3. Psychiatry Afflicted with or relating to cyclothymia.

n.  
  1. Mathematics The curve traced by a point on the circumference of a circle that rolls on a straight line.
  2. Zoology A fish having cycloid scales.


[French cycloïde, from Greek kukloeidēs, circular : kuklos, circle; see kwel-1 in Indo-European roots + -oeidēs, -oid.]

cy·cloi'dal (-kloid'l) adj.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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WordNet - Cite This Source - Share This
cycloidal

adjective
resembling a circle [syn: cycloid] 

WordNet® 3.0, © 2006 by Princeton University.
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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Cycloidal

Cy*cloid"al\ (-al), a. Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.

Cycloidal engine. See Geometric lathe.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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