cycloid

[ sahy-kloid ]

/ ˈsaɪ klɔɪd /

adjective

resembling a circle; circular.

(of the scale of a fish) smooth-edged, more or less circular in form, and having concentric striations.

(of a fish) having such scales.

Psychiatry. of or noting a personality type characterized by wide fluctuation in mood within the normal range.

noun

a cycloid fish.

Geometry. a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line.

Origin of cycloid

First recorded in 1655–65, cycloid is from the Greek word kykloeidḗs like a circle. See cycl-, -oid

OTHER WORDS FROM cycloid

cy·cloi·dal, adjectivecy·cloi·dal·ly, adverb

Words nearby cycloid

cyclohexane, cyclohexanone, cycloheximide, cyclohexylamine, cyclohexylsulfamic acid, cycloid, cycloidal propulsion, cyclolysis, cyclometer, cyclonal, cyclone

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for cycloid

The tail is diphycercal in all, ending in a long point, and the body is covered with cycloid scales.
A Guide to the Study of Fishes, Volume 1 (of 2)|David Starr Jordan
A cycloid scale is a flat thin scale with concentric markings and an entire posterior margin.
The Vertebrate Skeleton|Sidney H. Reynolds
Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid.
Zoology: The Science of Animal Life|Ernest Ingersoll
The cycloid has been called by Montucla, the Helen of geometers.
Introduction to the Literature of Europe in the Fifteenth, Sixteenth, and Seventeenth Centuries, Vol. 2|Henry Hallam

Pascal is said to have written his treatise on the cycloid from a religious motive.
Sir Christopher Wren|Lucy Phillimore

British Dictionary definitions for cycloid

cycloid

/ (ˈsaɪklɔɪd) /

adjective

resembling a circle

(of fish scales) rounded, thin, and smooth-edged, as those of the salmon

psychiatry (of a type of personality) characterized by exaggerated swings of mood between elation and depressionSee also cyclothymia

noun

geometry the curve described by a point on the circumference of a circle as the circle rolls along a straight lineCompare trochoid (def. 1)

a fish that has cycloid scales

Derived forms of cycloid

cycloidal, adjectivecycloidally, 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

Scientific definitions for cycloid

cycloid

[ sī′kloid′ ]

Resembling a circle.

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

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

单词	cycloid
释义	cycloid [ sahy-kloid ] / ˈsaɪ klɔɪd / adjective resembling a circle; circular. (of the scale of a fish) smooth-edged, more or less circular in form, and having concentric striations. (of a fish) having such scales. Psychiatry. of or noting a personality type characterized by wide fluctuation in mood within the normal range. noun a cycloid fish. Geometry. a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line. Origin of cycloid First recorded in 1655–65, cycloid is from the Greek word kykloeidḗs like a circle. See cycl-, -oid OTHER WORDS FROM cycloid cy·cloi·dal, adjectivecy·cloi·dal·ly, adverb Words nearby cycloid cyclohexane, cyclohexanone, cycloheximide, cyclohexylamine, cyclohexylsulfamic acid, cycloid, cycloidal propulsion, cyclolysis, cyclometer, cyclonal, cyclone Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for cycloid The tail is diphycercal in all, ending in a long point, and the body is covered with cycloid scales. A Guide to the Study of Fishes, Volume 1 (of 2)\|David Starr Jordan A cycloid scale is a flat thin scale with concentric markings and an entire posterior margin. The Vertebrate Skeleton\|Sidney H. Reynolds Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid. Zoology: The Science of Animal Life\|Ernest Ingersoll The cycloid has been called by Montucla, the Helen of geometers. Introduction to the Literature of Europe in the Fifteenth, Sixteenth, and Seventeenth Centuries, Vol. 2\|Henry Hallam Pascal is said to have written his treatise on the cycloid from a religious motive. Sir Christopher Wren\|Lucy Phillimore British Dictionary definitions for cycloid cycloid / (ˈsaɪklɔɪd) / adjective resembling a circle (of fish scales) rounded, thin, and smooth-edged, as those of the salmon psychiatry (of a type of personality) characterized by exaggerated swings of mood between elation and depressionSee also cyclothymia noun geometry the curve described by a point on the circumference of a circle as the circle rolls along a straight lineCompare trochoid (def. 1) a fish that has cycloid scales Derived forms of cycloid cycloidal, adjectivecycloidally, 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 Scientific definitions for cycloid cycloid [ sī′kloid′ ] Resembling a circle. Thin, rounded, and smooth-edged, like a disk. Used of fish scales. The curve traced by a point on the circumference of a circle that rolls on a straight line. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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