Other forms: tricycles
For many kids, their first vehicle is a tricycle, or a small three-wheeled bike.
Though a child's riding toy is what the word tricycle brings to mind, there are also adult-sized three-wheeled tricycles. A tricycle is safer and more stable than a bicycle with its two wheels, and some older or disabled people enjoy riding them. The original meaning of tricycle, in 1828, was "three-wheeled carriage," from the Greek treis, "three," and kyklos, "circle or wheel."