Etymology
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decontaminate (v.)

"remove the contamination from," 1936, from de- "do the opposite of" + contaminate (v.). Originally in reference to poison gas. Related: Decontaminated; decontaminating; decontamination.

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Definitions of decontaminate

decontaminate (v.)
rid of contamination;
The soil around the housing development had to be decontaminated by the city
From wordnet.princeton.edu