1. [ noun ] a pedal that controls the throttle valve
Synonyms: gas gas_pedal throttle gun accelerator_pedal

"he stepped on the gas"

Related terms: pedal car airplane accelerate
2. [ noun ] a valve that regulates the supply of fuel to the engine
Synonyms: throttle throttle_valve
Related terms: valve fuel_system
3. [ noun ] (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
Synonyms: catalyst
Related terms: anticatalyst activator enzyme platinum_black biocatalyst chemistry
4. [ noun ] (high energy physics) a scientific instrument that increases the kinetic energy of charged particles
Synonyms: atom_smasher particle_accelerator
Related terms: scientific_instrument betatron charge-exchange_accelerator cyclotron linear_accelerator Cockcroft_and_Walton_accelerator collider storage_ring
Similar spelling:   acceleratory