A person, device, or substance that deactivates or turns off something.
From 'deactivate' with the agent suffix '-or' (like creator, inventor). This suffix creates nouns describing entities that perform the action of the root verb.
In chemistry, deactivators are chemicals added to products to stop unwanted reactions—like adding deactivators to prevent fuel oxidation in stored gasoline, which is why fuel stabilizers cost extra but save your engine from gum buildup.
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