noun, plural impurities for 2.
the quality or state of being impure.
Often, impurities. something that is or makes impure: After the flood the authorities warned against impurities in the drinking water.

1400–50; late Middle English impurite < Latin impūritās. See impure, -ity

1. contamination, pollution, taint. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impurity (ɪmˈpjʊərɪtɪ)
n , pl -ties
1.  the quality of being impure
2.  an impure thing, constituent, or element: impurities in the water
3.  electronics acceptor See also donor a small quantity of an element added to a pure semiconductor crystal to control its electrical conductivity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To be virtuous is to be physically clean and free from the impurity that is sin.
The problem of impurity is especially germane to herbal combinations.
Copper sulfide ores have copper selenide as an impurity.
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