retardant

retardant

[ri-tahr-dnt]
noun Chemistry.
1.
any substance capable of reducing the speed of a given reaction.
adjective
2.
retarding or tending to retard (usually used in combination): fire-retardant construction materials.

Origin:
1635–45; retard + -ant

retardance, retardancy, noun
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World English Dictionary
retardant (rɪˈtɑːdənt)
 
n
1.  a substance that reduces the rate of a chemical reaction
 
adj
2.  having a slowing effect

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