Noun: scoria (scoriae) sko-ree-u
- The scum formed by oxidation at the surface of molten metals
"Scoria was removed from the surface of the molten iron";
- slag, dross
- (geology) dark-coloured volcanic rock containing many air spaces
"The volcanic scoria was light and porous"
Derived forms: scoriae
Type of: scum
Encyclopedia: Scoria