1. a circular firework that spins round and round emitting colored fire

Synonym: catherine wheel

2. a toy consisting of vanes of colored paper or plastic that is pinned to a stick and spins when it is pointed into the wind

Synonym: pinwheel wind collector

3. a wheel that has numerous pins that are set at right angles to its rim

e.g. he spun the pinwheel and it stopped with the pointer on `Go'

4. perennial subshrub of Tenerife having leaves in rosettes resembling pinwheels

Synonym: Aeonium haworthii