a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line

a curve traced by a point in the circumference of a wheel when the wheel is rolled along in a straight line

a curve traced by a point on the circumference of a cycle as the circle rolls along a straight line

a path generated by a circle on a straight line

a curve traced by any point on the circumference of a circle that rolls without sliding on a straight line. The area under one arch of the cycloid (blue, in the diagram) is exactly three times the area of the circle.

1. A curve traced by any point on the circumference, or on a radius, of a circle which rolls without slipping through one complete revolution along a straight line in a single plane. 2. Designating or having fish scales that are rounded in form with smooth edges. 3. Circular.

(n) A curve generated by the motion of a point on the circumference of a circle that is rolled in a plane along a straight line.

A cycloid is the curve defined by a fixed point on a wheel as it rolls, or, more precisely, the locus of a point on the rim of a circle rolling along a straight line.

a type of scale found in fish. The cycloid scale is thin and essentially round. Cycloid scales grow by concentric additions. In some species scales show growth rings, with spring and summer rings well-separated, and little growth in winter. If present, this allows age and growth rate to be estimated. See Cycloid and Ctenoid Scales.