Source : Webster's Revised Unabridged Dictionary (1913)

Motor cycle \Motor cycle\, or Motorcycle \Mo"tor*cy`cle\, n.
   A bicycle having a motor attached so as to be self-propelled.
   In Great Britain the term motor cycle is treated by statute
   (--3 Ed VII. c. 36) as limited to motor cars (self-propelled
   vehicles) designed to travel on not more than three wheels,
   and weighing unladen (that is, without water, fuel, or
   accumulators necessary for propulsion) not more than three
   hundred weight (336 lbs.).

Source : WordNet®

motorcycle
     n : a motor vehicle with two wheels and a strong frame [syn: {bike}]

motorcycle
     v : ride a motorcycle [syn: {cycle}]