Definition of 'accelerator'

Noun

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

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