This is derived from an old English word.
drossdrɒs/
noun
noun: dross
-
2.foreign matter, dregs, or mineral waste, in particular scum formed on the surface of molten metal.“alchemists tried to create gold from dross”
Origin
Old English drōs (in the sense ‘scum on molten metal’); related to Dutch droesem and German Drusen ‘dregs, lees’.
