Webster's English Dictionary

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tractor

trac.tor \'trak-t*r\ n [NL, fr. L tractus, pp.] 1: TRACTION ENGINE  2a: a 
   4-wheeled or Caterpillar-tread rider-controlled automotive vehicle us ed 
   esp. for drawing implements (as agricultural) or for bearing and propelling 
   such implements 2b: a smaller 2-wheeled apparatus controlled through 
   handlebars by a walkin g operator 2c: a truck with short chassis and no 
   body used in combination with a trail er for highway hauling of freight 3: 
   an airplane having the propeller forward of the main supporting surfaces