Definitions for

**"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.

a line generated by a point on a circle rolling along a straight line

resembling a circle

said of the scales of typical soft-rayed fishes having smooth posterior margins (smooth to the touch)

Smooth, with circular or concentric lines of growth (refers to fish scales).

(of fish scales) smooth and rounded

**Keywords:**pertaining

Of or pertaining to the Cycloidei.

**Keywords:**one

One of the Cycloidei.