English Lexicon

Retarder

/rɪˈtɑːrdər/
nounCEFR B2 (Upper)Top #15000 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A substance that slows down a chemical reaction or process.

    "The engineer added a retarder to the mixture to control the setting time of the concrete."
  2. 2

    A device used to slow down or control the speed of a machine or vehicle.

    "The truck was equipped with a retarder to enhance its braking system on steep descents."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The term 'retarder' originates from the French word 'retarder', which means 'to delay'. It entered English usage in the early 20th century, primarily in technical contexts, evolving to refer to substances that slow down chemical reactions or processes.

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