the curve traced by any point in the plane of a given curve when the latter rolls, without sliding, over another fixed curve. See Cycloid, and Epycycloid.
a line generated by a point on one figure rolling around a second figure
(n) The curve generated by the rolling contact of one curve or line on another. Any point attached to the rolling curve will describe a roulette curve. The moving point is called the generating point. The roulette is constructed by moving the rolling curve to a number of new positions and plotting the corresponding positions of the generating point.