something that contaminates.

1920–25; < Latin contāminant- (stem of contāmināns), present participle of contāmināre. See contaminate, -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
So the change in coloration indicated that the frogs' extremely thin, sensitive
  skin was reacting to contaminants in the water.
The main challenge is to make sure that past contaminants don't enter into the
The water is contaminated naturally by sandstone, which has slowly leached
  radioactive contaminants over the eons.
In wastewater pools they give bacteria more space to grow and thus allow
  biological contaminants to be consumed more quickly.
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