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Accelerator Definition

Noun: accelerator  ak'se-lu,rey-tu(r)

  1. A pedal that controls the throttle valve
    "he stepped on the accelerator";
    - accelerator pedal, gas pedal [N. Amer], gas [N. Amer], throttle, gun
     
  2. A valve that regulates the supply of fuel to the engine
    - throttle, throttle valve
     
  3. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    - catalyst
     
  4. A scientific instrument that increases the kinetic energy of charged particles
    - particle accelerator, atom smasher
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