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

accelerator \accel"era`tor\, n.
   one who, or that which, accelerates. also as an adj.; as,
   accelerator nerves.
   1913 webster

[2] : WordNet (r) 2.0

accelerator
     n 1: a pedal that controls the throttle valve; "he stepped on the
          gas" syn: accelerator pedal, gas pedal, gas, throttle,
           gun
     2: a valve that regulates the supply of fuel to the engine
        syn: throttle, throttle valve
     3: chemistry a substance that initiates or accelerates a
        chemical reaction without itself being affected syn: catalyst
        ant: anticatalyst
     4: a scientific instrument that increases the kinetic energy of
        charged particles syn: particle accelerator, atom
        smasher
see also:
accelerator pedal gas pedal gas throttle gun throttle valve 
catalyst anticatalyst particle accelerator atom smasher 

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

67 moby thesaurus words for "accelerator":
   pcv valve, alternator, ammeter, atom smasher, atomic accelerator,
   atomic cannon, bearings, bonnet, boot, brake, bucket seat, bumper,
   camshaft, carburetor, chassis, choke, clutch, connecting rod,
   convertible top, cowl, crank, crankcase, crankshaft, cutout,
   cylinder, cylinder head, dash, dashboard, differential,
   distributor, exhaust, exhaust pipe, fan, fender, flywheel, gear,
   gearbox, gearshift, generator, headlight, headrest, hood, horn,
   ignition, intake, manifold, muffler, parking light,
   particle accelerator, piston, power brakes, power steering,
   radiator, rear-view mirror, seat belt, shock absorber, spark plug,
   speedometer, springs, starter, steering wheel, top, transmission,
   universal, valve, windscreen, windshield

[4] : The Free On-line Dictionary of Computing (27 SEP 03)

accelerator
     
         additional hardware to perform some function faster
        than is possible in software running on the normal cpu.
        examples include graphics accelerators and floating-point
        accelerators.
     
        1994-11-08
     
     
see also:
cpu graphics accelerator floating-point accelerator 

Accelerator >> A Words
Accelerator, definition of term: Accelerator
accelerator_pag1.html