Longman Dictionary of Contemporary English homepage

impurity

 noun
     
im‧pu‧ri‧ty plural impurities
1 [countable usually plural] a substance of a low quality that is contained in or mixed with something else, making it less pure:
All natural minerals contain impurities.
Our oatmeal face mask absorbs impurities from your skin.
2 [uncountable] the state of being impure
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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