something that speeds up a process.
Chemistry, (def 5).
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.
Contemporary Examples

Also in the apartment were glass jars containing what is believed to be accelerant, black gunpowder, and bullets.
How Alleged Colorado Shooter James Holmes Bought His Guns Christine Pelisek, Eliza Shapiro July 20, 2012

Thrown into the Middle East pyre, the Zionism-racism charge has been an accelerant, angering, alienating, polarizing both sides.
Delegitimizing Israel Makes Peace Harder to Achieve Gil Troy February 27, 2013

(chem) another name for accelerator (sense 3)

1854, from Latin accelerantem (nominative accelerans), present participle of accelerare (see accelerate). As an adjective from 1890.

accelerant ac·cel·er·ant (āk-sěl’ər-ənt)
A substance, such as a petroleum distillate, that is used as a catalyst, as in spreading an intentionally set fire.

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