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contaminant

/kɒntəˈmeɪnt/ · con.ta.mi.nant
noun
  1. That which contaminates; an impurity; foreign matter. Put the lid on the jar to keep contaminants out.
  2. A substance that can cause pollution or harm to the environment. The factory's contaminant emissions were found to be above the acceptable limit.
  3. A substance that can cause disease or infection. The water was contaminated with bacteria, making it unsafe to drink.
Did you know? The term 'contaminant' is often used in the context of environmental science, where it refers to any substance that can cause harm to the environment or human health.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 28, 2026