WordReference Random House Unabridged Dictionary of American English © 2020
ac•cel•er•ant  (ak selər ənt),USA pronunciation n. 
  1. something that speeds up a process.
  2. Chemistryaccelerator (def. 5).
  3. a substance that accelerates the spread of fire or makes a fire more intense:Arson was suspected when police found accelerants at the scene of the fire.
  • Latin accelerant- (stem of accelerāns) hastening (present participle of accelerāre). See accelerate
  • 1915–20

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