tractor

(trăkˈtər)

1. A vehicle having a powerful gasoline or diesel motor and usually large, heavily treaded rear tires, used especially for pulling farm implements or machinery.
2. A truck having a cab and no body, used for pulling large vehicles such as vans or trailers.
3. Something that pulls or draws.
4. a. An airplane propeller mounted in front of the supporting surfaces.
   b. An airplane having such a propeller.
5. A toothed mechanism that automatically advances perforated continuous-form paper through a computer printer.