
1) Admixture 2) Adulteration 3) Antipollution 4) Contaminant 5) Contamination 6) Debasement 7) Dross 8) Impureness 9) Pollution 10) Putridity 11) Taint 12) Uncleanness 
Found on 
https://www.crosswordclues.com/clue/impurity

1) Bawdry 2) Double entente 3) Dross 4) Equivoque 5) Fescennine 6) Foreign matter 7) French word used in English 8) Grossness 9) Immodesty 10) Impudicity 11) Indecency 12) Indelicacy 13) Obscenity 14) Ribaldry 15) Smut 16) The condition of being impure 17) Uncleanness 18) Waste 19) Waste material 20) Waste matter 
Found on 
https://www.crosswordclues.com/clue/impurity

- worthless material that should be removed
 - the condition of being impure
 
Found on 

Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound.
Found on 
http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms

 Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound. Impurities are either naturally occurring or added during synthesis of a chemical or commercial product. During production, impurities may be purposely, accidentally, inevitably, or incidentally added...
Found on 
http://en.wikipedia.org/wiki/Impurity

• (n.) Want of ceremonial purity; defilement. • (n.) That which is, or which renders anything, impure; foul matter, action, language, etc.; a foreign ingredient. • (n.) The condition or quality of being impure in any sense; defilement; foulness; adulteration.
Found on 
http://thinkexist.com/dictionary/meaning/impurity/

A substance unintentionally contained in a product other than the desired substance.
Found on 
http://www.chemicalglossary.net/definition/949-Impurity

foreign atoms in a single-element semiconductor foreign atoms or either an excess or a deficiency of atoms with respect to the stochiometric composition of a compound semiconductor
Found on 
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=521-02-04

Origin: L. Impuritas: cf. F. Impurete. ... 1. The condition or quality of being impure in any sense; defilement; foulness; adulteration. 'Profaneness, impurity, or scandal, is not wit.' (Buckminster) ... 2. That which is, or which renders anything, impure; foul matter, action, language, etc.; a foreign ingredient. 'Foul impurities reigned among the...
Found on 
http://www.encyclo.co.uk/local/20973

 An item present in a mineral which is not part of its integral structure, and may change its optical properties, such as color.
Found on 
http://www.encyclo.co.uk/local/22291
Im·pu'ri·ty  noun ; 
 plural Impurities . [ Latin 
 impuritas : confer French 
 impureté .] 
 1.  The condition or quality of being impure in any sense; defilement; foulness; adulteration. « Profaneness, 
 impurity , or scandal, is not wit.» 
 Buckminster....
Found on 
http://www.encyclo.co.uk/webster/I/26

[
n] - worthless material that should be removed 2. [n] - the condition of being impure
Found on 
http://www.webdictionary.co.uk/definition.php?query=impurity

An element unintentional allowed in a metal or alloy. Some impurities have little effect on properties; others will grossly damage the alloy.
Found on 
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

A foreign atom in a crystal. See also: Crystal, Donor.
Found on 
https://www.encyclo.co.uk/local/20687

the quality or state of being impure. · Often,something that is or makes impure: After the flood the authorities warned against impurities in the drinking water.
Found on 
https://www.infoplease.com/dictionary/impurity
[ASVAB glossary] the condition of having extraneous elements
Found on 
https://www.vocabulary.com/lists/1154621
  No exact match found.