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

motor \mo"tor\, n. l., fr. movere, motum, to move.
   1. one who, or that which, imparts motion; a source of
      mechanical power.
      1913 webster

   2. mach. a prime mover; a machine by means of which a
      source of power, as steam, moving water, electricity,
      etc., is made available for doing mechanical work.
      1913 webster

   3. a motor car; an automobile. archiac colloq.
      webster 1913 suppl. motory
      motor

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

motor \mo"tor\, motory \mo"tory\, motorial \moto"rial\, a.
   l. motorius that has motion. see motor, n.
   causing or setting up motion; pertaining to organs of motion;
   -- applied especially in physiology to those nerves or nerve
   fibers which only convey impressions from a nerve center to
   muscles, thereby causing motion.
   1913 webster
see also:
motor 

[3] : WordNet (r) 2.0

motor
     adj 1: conveying information to the muscles from the cns; "motor
            nerves" syn: centrifugal, motora
     2: causing or able to cause motion; "a motive force"; "motive
        power"; "motor energy" syn: motivea
     n 1: machine that converts other forms of energy into mechanical
          energy and so imparts motion
     2: a nonspecific agent that imparts motion; "happiness is the
        aim of all men and the motor of all action"
     v : travel or be transported in a vehicle; "we drove to the
         university every morning"; "they motored to london for
         the theater" syn: drive
see also:
centrifugal motora motivea drive 

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

97 moby thesaurus words for "motor":
   active, aeromotor, alembic, anvil, appliance, arc-jet engine, auto,
   autocar, automobile, axial-flow turbojet, bicycle, bike, boat,
   buggy, bus, caldron, cam engine, car, catch a train, charioteer,
   chauffeur, convenience, crate, crucible, cycle, drive, driving,
   engine, enginery, entrain, facility, fixture, gas jet, go by rail,
   heap, impelling, impulse duct engine, in motion, inverted engine,
   jalopy, joyride, lathe, machine, machinery, make a train,
   mechanical aid, mechanical device, mechanism, melting pot, mobile,
   mortar, motile, motivational, motive, motive power, motor vehicle,
   motorcar, motorcycle, motorized vehicle, moving, pancake engine,
   pedal, pilot, piston engine, power plant, power source, propellant,
   propeller-jet engine, propelling, propjet, radial engine, ramjet,
   reciprocating engine, retort, ride, rocket motor, rotary engine,
   stirring, supercharged engine, take a joyride, taxi, test tube,
   tool, transducer, transformer, transitional, traveling, tub,
   turbine, turbojet, turboprop, utility, vertical engine, voiture,
   wheel, wheels, wreck

Motor >> M Words
Motor, definition of term: Motor
motor_pag1.html

Motor Nerve >> M Words
Motor Nerve, definition of term: Motor Nerve
motor+nerve_pag1.html

Motor Oil >> M Words
Motor Oil, definition of term: Motor Oil
motor+oil_pag1.html

Motor Vehicle >> M Words
Motor Vehicle, definition of term: Motor Vehicle
motor+vehicle_pag1.html

Motor Generator >> M Words
Motor Generator, definition of term: Motor Generator
motor+generator_pag1.html

Motor Cycle >> M Words
Motor Cycle, definition of term: Motor Cycle
motor+cycle_pag1.html

Motor Control >> M Words
Motor Control, definition of term: Motor Control
motor+control_pag1.html

Motor Cortex >> M Words
Motor Cortex, definition of term: Motor Cortex
motor+cortex_pag1.html

Electric Motor >> E Words
Electric Motor, definition of term: Electric Motor
electric+motor_pag1.html