a mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks

A solid disk or a rigid circular ring connected by spokes to a hub, designed to turn around an axle passed through the center, A firework that rotates while burning, Informal A bicycle, intransitive verb_ To roll or move on or as if on wheels or a wheel, To provide with wheels or a wheel, To turn or whirl around in place; pivot