contamination
transitive-verb
To make something impure or unsuitable by adding a poisonous or polluting substance to it.
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Oil spills can contaminate beaches and harm wildlife.
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The factory was fined for contaminating the river with chemical waste.
To make a place or substance dangerous or less pleasant by adding something harmful or unwanted to it.
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Ensure that sterile equipment is used, so as not to contaminate the wound during surgery.
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The investigation revealed that the organization's funds had been contaminated by money laundering activities.