Dross – meaning of the word and examples

The scum or unwanted material that forms on the surface of molten metal. (Merriam – Webster)

Waste or foreign matter: Impurity. (Merriam – Webster)

Something that is base, trivial or inferior. (Merriam – Webster)

Waste matter; refuse. (Dictionary.com)

Waste product taken off molten metal during smelting, essentially metallic in character. (Dictionary.com)

If you describe something as dross, you mean that it is of very poor quality or has no value. (Collins Dictionary)

Something that has no use or no value: (Cambridge Dictionary)

Something regarded as worthless; rubbish. (Oxford Dictionaries)

Foreign matter, dregs, or mineral waste, in particular scum formed on the surface of molten metal. (Oxford Dictionaries)

Examples

Aluminium dross. 

https://commons.wikimedia.org/wiki/File:Aluminium_dross.png

A Characterisation Method for Al Recovery from Dross Based on Compression at Elevated Temperatures.

https://www.hindawi.com/journals/at/2011/395716/

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