retarder
Noun
Meaning
One who, or that which, retards.
Source: Webster's dictionarySynonyms
Antonyms
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An accelerator speeds up the cure reaction, while a retarder delays it.
A waveplate or retarder is an optical device that alters the polarization state of a light wave travelling through it.
Highly effective foam retarder for water borne coating systems based on polymer emulsions, alkyd emulsions or hybrid systems.
If you use them as if they were oils and you were an impressionist, you can do the alla prima, impressionist thing, and complete your painting with a single layer, although you might have to use an acrylic retarder to do so.
The fuze for a retarded bomb requires that the retarder be open a minimum time to ensure safe separation.