- hamster wheel (defs. 1, 2).
- a cage containing a hamster wheel.
- a cage consisting of a cylindrical framework that is made to rotate by a small animal running inside the framework
- a repetitive purposeless task, way of life, etc
- the rotor of an induction motor with a cylindrical winding having copper bars around the periphery parallel to the axis
- an electric fan with many long narrow blades arranged in parallel so as to form a cylinder about an axis around which they spin
