accelerator
n//ækˈsɛl.əˌɹeɪ.tɚ//accelerator, gaspedal
One who, or that which, accelerates.
(chemistry) A substance which speeds up chemical reactions.
A device for causing acceleration.
(vehicle) A pedal causing the vehicle to accelerate when it is pressed.
(physics) A device that accelerates charged subatomic particles; a particle accelerator.