accelerator

noun

1. a pedal that controls the throttle valve

Similar word(s): gas, gun, throttle

Definition categories: man–made, pedal, treadle

2. a valve that regulates the supply of fuel to the engine

Similar word(s): throttle

Definition categories: man–made, valve

3. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

Similar word(s): catalyst

Definition categories: substance, activator

4. a scientific instrument that increases the kinetic energy of charged particles

Definition categories: man–made