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retarder

[ri-tahr-der] /rɪˈtɑr dər/
noun
1.
a person or thing that retards.
2.
Chemistry.
  1. any substance added to rubber to delay or prevent vulcanization.
  2. any substance added to delay a process.
3.
Building Trades. an admixture of concrete or plaster that retards its set.
Origin
1635-1645
1635-45; retard + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retarder

retarder

/rɪˈtɑːdə/
noun
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for retarder
n.

1640s, agent noun from retard (v.). Of railway braking mechanisms from 1937.

Online Etymology Dictionary, © 2010 Douglas Harper
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9
9
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