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retarder

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re⋅tard⋅er

  [ri-tahr-der]
Use retarder in a Sentence
–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 + -er 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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re·tard 1   (rĭ-tärd')   
v.   re·tard·ed, re·tard·ing, re·tards

v.   tr.
To cause to move or proceed slowly; delay or impede.
v.   intr.
To be delayed.
n.  

  1. A slowing down or hindering of progress; a delay.

  2. Music A slackening of tempo.


[Middle English retarden, from Old French retarder, from Latin retardāre : re-, re- + tardāre, to delay (from tardus, slow).]
re·tard'er n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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