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impurity

noun [C or U] (MIXED)
 
 
/ɪmˈpjʊə.rɪ.ti/ US  /-ˈpjʊr.ə.t̬i/

Definition

the fact that a substance is dirty or lower in quality because it is mixed with another substance, or something that causes this: Impurities are removed from the blood by the kidneys. The impurity of the water is a health risk.Dirt and untidiness
(Definition of impurity noun (MIXED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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