Partly burned or vitrified coal, or other combustible, in which fire is extinct.
- A burned or partly burned substance, such as coal, that is not reduced to ashes but is incapable of further combustion.
- A partly charred substance that can burn further but without flame.
- Geology See scoria.
- Metallurgy See scoria.
- Slag from a metal furnace.
- To burn or reduce to cinders.