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ACCELERATOR

Definition:

[noun] a pedal that controls the throttle valve; "he stepped on the gas"
Synonyms: pedal, gas pedal, gas, throttle, gun
[noun] a valve that regulates the supply of fuel to the engine
Synonyms: throttle, throttle valve
[noun] (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
Synonyms: catalyst
[noun] a scientific instrument that increases the kinetic energy of charged particles
Synonyms: particle atom smasher