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English word:    

accelerator

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accelerator in WordNet English dictionary

noun
  1. a valve that regulates the supply of fuel to the engine
    accelerator  throttle  throttle valve 
  2. a scientific instrument that increases the kinetic energy of charged particles
    accelerator  particle accelerator  atom smasher 
  3. a pedal that controls the throttle valve
    "he stepped on the gas"
    accelerator  accelerator pedal  gas pedal  gas  throttle  gun 
  4. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    catalyst  accelerator 
WordNet Lexical Database v3.0, © 2006 Princeton University