accelerator

/æksˈɛlɝeɪtɝ/

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Definitions

Noun
a pedal that controls the throttle valve; "he stepped on the gas"
Noun
a valve that regulates the supply of fuel to the engine
Noun
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
Noun
a scientific instrument that increases the kinetic energy of charged particles