Noun accelerator has 4 senses
  1. accelerator, accelerator pedal, gas pedal, gas, throttle, gun - a pedal that controls the throttle valve; "he stepped on the gas"
    --1 is a kind of pedal, treadle, foot pedal, foot lever
    --1 is a part of
     car, auto, automobile, machine, motorcar; airplane, aeroplane, plane
    Derived form: verb accelerate2
  2. accelerator, throttle, throttle valve - a valve that regulates the supply of fuel to the engine
    --2 is a kind of valve
    --2 is a part of fuel system
    Derived form: verb accelerate2
  3. catalyst, accelerator - (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    --3 is a kind of activator
    --3 has particulars: biocatalyst; enzyme; platinum black
  4. accelerator, particle accelerator, atom smasher - a scientific instrument that increases the kinetic energy of charged particles
    --4 is a kind of scientific instrument
    --4 has parts: storage ring
    --4 has particulars:
     betatron, induction accelerator; charge-exchange accelerator; Cockcroft and Walton accelerator, Cockcroft-Walton accelerator, Cockcroft and Walton voltage multiplier, Cockcroft-Walton voltage multiplier; collider; cyclotron; linear accelerator, linac