something that speeds up a process.
Chemistry, accelerator ( 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.

1915–20; < Latin accelerant- (stem of accelerāns) hastening (present participle of accelerāre). See accelerate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
accelerant (ækˈsɛlərənt)
chem another name for accelerator
[C20: from Latin from accelerāns, present participle of accelerāre to go faster]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

accelerant ac·cel·er·ant (āk-sěl'ər-ənt)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
accelerant   (āk-sěl'ər-ənt)  Pronunciation Key 
A substance, such as a petroleum distillate, that is used as a catalyst, as in spreading an intentionally set fire.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Of course, demand is a key component to driving value, but the defective nature
  of the appraisal process served as an accelerant.
But the scheme is more likely to be an ironic accelerant of it.
Gun-cotton is used as an accelerant in almost every firearm, including cannons.
Cloud seeding sounds fundamentally dangerous as a potential accelerant to
  climate change.
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