Definition from Wiktionary, the free dictionary
accelerant (plural accelerants)
- (chemistry) Any substance that can bond, mix, or disturb another substance and cause an increase in the speed of a natural or artificial chemical process.
- A substance that accelerates the development of a fire; especially some petroleum product used to spread an act of arson
- (chemistry) A substance used to catalyze the vulcanization of rubber
substance that accelerates the devolpment of a fire
substance used to catalyze the vulcanization of rubber
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See also 
- Present participle of accelerar.
- third-person plural present active indicative of accelerō