n. A contrate wheel in which the cogs are pins set into the disk.n. In tanning, a stout circular box containing warm water or water and melted tallow, in which hides are rolled about over strong wooden pins fastened to the inner circumference of the box.n. A kind of firework, consisting of a long paper case filled with a combustible composition and wound spirally about a disk of pasteboard or wood. When it is supported vertically on a pivot, and ignited, it revolves rapidly, forming a wheel of fire.In tanning, to subject to the action of the pinwheel.