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