retarder

1. Something which retards or slows.

   The substance acted as a retarder to the chemical reaction because it radically changed the pH.

2. A device for slowing down large trucks, lorries, buses, shunted railway wagons.

3. A refrigerator used to slow down proofing of yeast when making dough.

1. Apparently, some trucks need a special device called a “brake retarder” in order to stop or slow down on certain road conditions.

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