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Cy"cloid (s?"kloid), n.[Cyclo- + -oid: cf. F. cyclode.] (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.
Cy"cloid a.(Zol.) Of or pertaining to the Cycloidei. Cycloid scale (Zol.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.
Cy"cloid n.(Zol.) One of the Cycloidei.
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