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What is the opposite of contaminant?

Need antonyms for contaminant? Here's a list of opposite words from our thesaurus that you can use instead.

Noun
Opposite of a toxic substance that is capable of causing illness or death
“Nitrite is also available for human use as an antidote for cyanide poisoning and is used in meat curing.”
Noun
Opposite of a constituent that impairs the purity of something
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