'accelerator' definitions:

Definition of 'accelerator'

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