[L. bis, twice ; and Gk. kyklos, a circle.] A two-wheeled velocipede propelled by treadles attached to cranks or levers. It has become a favorite vehicle, both in Europe and the United States, from its rapidity of motion and the ease with which it can be propelled.

Tandem

A Latin word meaning at length. Applied to horses driven one in front of the other. A bicycle carrying two, three or four persons.

Velocipede

A vehicle propelled by the feet of the rider. The common form is the two-wheeled bicycle, but tricycles and quadricycles are somewhat in use.

Tricycle

[Gk.] A vehicle with three wheels, one or more of which are turned by the feet by means of pedals.