n. 1. a light two-wheeled vehicle containing a motor for propulsion. It is lighter in construction and has a lower speed than a motorcycle. [ PJC ]
2. Specifically: a small motorcycle with a low frame and small weels and elevated handlebars. Syn. -- minibike. [ WordNet 1.5 ]
3. Specifically: a bicyle with a motor attached for propulsion. [ PJC ]