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.