Residue that forms on the surface of molten metal from oxidation.
Worthless or trivial matter.
The impurities in metal.
Waste or impure matter.
A waste product from working with metal.
To remove dross from.
The slag or dross that remains after the smelting of metal from an ore.
Rough masses of rock formed by solidified lava, and which can be found around a volcano's crater.