Etymology
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accelerator (n.)

1610s, "a hastener," from Latin accelerator, agent noun from accelerare "to hasten; make haste" (see accelerate). Motor vehicle sense of "pedal which operates the throttle and thus modulates engine speed" is from 1900; particle physics sense is from 1931.

updated on August 12, 2018

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Definitions of accelerator from WordNet

accelerator (n.)
a pedal that controls the throttle valve;
Synonyms: accelerator pedal / gas pedal / gas / throttle / gun
accelerator (n.)
a valve that regulates the supply of fuel to the engine;
Synonyms: throttle / throttle valve
accelerator (n.)
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected;
Synonyms: catalyst
accelerator (n.)
a scientific instrument that increases the kinetic energy of charged particles;
Synonyms: particle accelerator / atom smasher
From wordnet.princeton.edu, not affiliated with etymonline.