Noun
1. a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
2. a handwheel that is used for steering
3. a circular helm to control the rudder of a vessel
4. game equipment consisting of a rotating wheel with slots that is used for gambling; players bet on which slot the roulette ball will stop in
5. an instrument of torture that stretches or disjoints or mutilates victims
6. a wheeled vehicle that has two wheels and is moved by foot pedals