[1] : The Collaborative International Dictionary of English v.0.48

motor car \motor car\, or motorcar \mo"torcar`\, n.
   1. an automobile, locomobile, or locomotive designed to run
      and be steered on a street or roadway; esp., an automobile
      specially designed for passengers and propelled by an
      internal combustion engine.

   syn: car, auto, automobile, machine.
        webster 1913 suppl.

   2. elec. railroads any car containing motors for
      propulsion. u. s.
      webster 1913 suppl.

[2] : WordNet (r) 2.0

motorcar
     n : 4-wheeled motor vehicle; usually propelled by an internal
         combustion engine; "he needs a car to get to work" syn:
         car, auto, automobile, machine
see also:
car auto automobile machine 

[3] : Moby Thesaurus II by Grady Ward, 1.0

18 moby thesaurus words for "motorcar":
   auto, autocar, automobile, boat, buggy, bus, car, crate, heap,
   jalopy, machine, motor, motor vehicle, motorized vehicle, tub,
   voiture, wheels, wreck

Motorcar >> M Words
Motorcar, definition of term: Motorcar
motorcar_pag1.html