Cy"cloid (s?"kloid), n. [Cyclo- + -oid: cf. F. cycloide.] Geom.
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.
⇒ The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference.
© Webster 1913.
Cy"cloid, a. Zool.
Of or pertaining to the Cycloidei.
Cycloid scale Zool., a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.
© Webster 1913.
Cy"cloid, n. Zool.
One of the Cycloidei.
© Webster 1913.