Definition: bicycle

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Source: WordNet (r) 1.7 

bicycle
     n : a cycle that has two wheels; moved by foot pedals [syn: bike,
          wheel]
     v : ride a bicycle [syn: cycle, bike, pedal, wheel]

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.