retarder

retarder

[ri-tahr-der]
noun
1.
a person or thing that retards.
2.
Chemistry.
a.
any substance added to rubber to delay or prevent vulcanization.
b.
any substance added to delay a process.
3.
Building Trades. an admixture of concrete or plaster that retards its set.

Origin:
1635–45; retard + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
retarder (rɪˈtɑːdə)
 
n
1.  a person or thing that retards
2.  a substance added to slow down the rate of a chemical change, such as one added to cement to delay its setting

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