Source : Webster's Revised Unabridged Dictionary (1913)

Bicycle \Bi"cy*cle\, n. [Pref. bi- + cycle.]
   A light vehicle having two wheels one behind the other. It
   has a saddle seat and is propelled by the rider's feet acting
   on cranks or levers.

Source : WordNet®

bicycle
     n : a wheeled vehicle that has two wheels and is moved by foot
         pedals [syn: {bike}, {wheel}, {cycle}]

bicycle
     v : ride a bicycle [syn: {cycle}, {bike}, {pedal}, {wheel}]