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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
He obtained and partially examined many gases, but rarely troubled about
  separating them completely from impurities.
Against the licentiousness of the pagans he shows that all impurities are sins
  against reason.
Semiconductor-grade silicon must be ultrapure before doping, or adding tiny
  amounts of impurities to change its conductivity.
Wash the remainder with water to remove impurities and surplus lye.
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