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  1. [noun] a pedal that controls the throttle valve; "he stepped on the gas"
    Synonyms: pedal, gas pedal, gas, throttle, gun

  2. [noun] a valve that regulates the supply of fuel to the engine
    Synonyms: throttle, throttle valve

  3. [noun] (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    Synonyms: catalyst

  4. [noun] a scientific instrument that increases the kinetic energy of charged particles
    Synonyms: particle atom smasher


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