scoria
1. [ noun ] the scum formed by oxidation at the surface of molten metals
Synonyms: dross slag
Related terms: scum basic_slag
Similar spelling:   Schor
  sciara
  Schorr
  scry
  scar
  screw
  scree
  scour
  score
  Schur
  Scher
  scary
  scare
  scurry
  screwy
  scarey