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retarder

[ ri-tahr-der ]

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.

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

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Word History and Origins

Origin of retarder1

First recorded in 1635–45; retard + -er 1

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