extinguishant

[ik-sting-gwi-shuhnt]
noun
a substance used in extinguishing fires.

Origin:
extinguish + -ant

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World English Dictionary
extinguishant (ɪkˈstɪŋɡwɪʃənt)
 
n
a substance, such as a liquid, foam, powder, etc, used in extinguishing fires

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Electrically nonconducting, volatile, or gaseous fire extinguishant that does not leave a residue upon evaporation.
Electrically nonconducting, volatile or gaseous fire extinguishant that does not leave a residue upon evaporation.
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