accelerator

nouns

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