retarder

American  

[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.

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retarder British  

/ 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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Etymology

Origin of retarder

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

Example Sentences

They must also utilize a Class 1 vapor retarder with joints overlapping 6 inches, that extends up the stem wall and that is sealed from the exterior.

From Seattle Times

“That’s not character plaster. It’s not like there’s a steel frame under there and then you just put plaster on it and make it look like concrete. That is solid concrete, and as it was poured we had to rush rush rush to get retarder on it to make it look like it was aged and feed buckets of dirt into it. A lot of the land came down to hand-distressing everything with a giant sledgehammer.”

From Los Angeles Times

If a hot mug has left a mark on your table, Caperton suggests trying Mohawk’s No Blush Plus Retarder.

From Washington Post

The jury heard this was a result of the “poor condition of the hydraulic retarder”.

From The Guardian

The inquest jury heard the French report concluded the brake failed as the pad had been "completely destroyed by excessive heating" due to the "poor condition of the hydraulic retarder".

From BBC