cycloid

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cycloid

[′sī‚klȯid]
(mathematics)
The curve traced by a point on the circumference of a circle as the circle rolls along a straight line.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cycloid

A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.