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Related to prolate cycloid: Curtate cycloid
prolate cycloid[′prō‚lāt ′sī‚klȯid]
A trochoid in which the distance from the center of the rolling circle to the point describing the curve is greater than the radius of the circle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.