Dross
Part of speech: noun
Definition: Waste or impure matter Worthless or trivial matter Residue that forms on the surface of a metal from oxidation The impurities in metal A waste product from working with metal
Impurity
Part of speech: noun
Definition: The condition of being impure; because of contamination, pollution, adulteration or insufficient purification.A component or additive that renders something else impure.A state of immorality or sin; especially the weakness of the flesh: inchastity.