roulette, line roulette

a line generated by a point on one figure rolling around a second figure

• cycloid — a line generated by a point on a circle rolling along a straight line
• epicycloid — a line generated by a point on a circle rolling around another circle
• hypocycloid — a line generated by a point on a circle that rolls around inside another circle

• curve, curved shape — the trace of a point whose direction of motion changes