The Collaborative International Dictionary of English v.0.48:

Bike \Bike\, n. [Ethymol. unknown.]
   A nest of wild bees, wasps, or ants; a swarm. [Scot.] --Sir
   W. Scott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bike
    n 1: a motor vehicle with two wheels and a strong frame [syn:
         motorcycle, bike]
    2: a wheeled vehicle that has two wheels and is moved by foot
       pedals [syn: bicycle, bike, wheel, cycle]
    v 1: ride a bicycle [syn: bicycle, cycle, bike, pedal,
         wheel]