pinwheel (Noun) — Perennial subshrub of Tenerife having leaves in rosettes resembling pinwheels.
pinwheel (Noun) — A wheel that has numerous pins that are set at right angles to its rim. ex. "he spun the pinwheel and it stopped with the pointer on 'Go'"
pinwheel (Noun) — A toy consisting of vanes of coloured paper or plastic that is pinned to a stick and spins when it is pointed into the wind.
pinwheel (Noun) — A circular firework that spins round and round emitting coloured fire.