noun /vɪˈlɒs.ɪ.piːd,vɪˈlɑs.ɪ.pid/
a) Early two-wheeled conveyance upon which one rode astride a wooden frame propelled by means of pushing the feet against the ground.
b) Generic term for three and four-wheeled machines driven by foot or hand levers to the rear or front axle.
Wikipedia foundation.