Dross : meaning from online dictionary

This is  derived from an old English word.
facedross
drɒs/
noun
noun: dross
  1. 1.
    something regarded as worthless; rubbish.
    “there are bargains if you have the patience to sift through the dross”
    synonyms: rubbish, junk, debris, chaff, draff, detritus, flotsam and jetsam; More

  2. 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’.