noun
a substance that slows down or prevents a particular process or reaction
adjective
having the quality of slowing down or preventing a particular process or reaction
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The fire retardant material helped slow down the spread of the flames.
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Make sure to use the fire retardant spray before starting the bonfire.
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I heard this new fabric is super retardant against stains.
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His calm demeanor acted as a retardant against the chaos around him.