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.

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.
References in periodicals archive ?
4 and 5 that the equation for cd of the female rotor is a cycloid.
According the relation between d and r we speak about a curtate (contracted) cycloid (d < r) or about a prolate one (d > r).
Knorr has been stretched since then, and is no longer propelled by cycloids, but the labs and passageways were still familiar enough to bring back vivid memories.