noun
- a white crystalline oxide of aluminum that occurs naturally as corundum and is used in making aluminum, abrasives, and refractories
Usage: chemistry; materials science
Examples
- The factory processes bauxite ore to extract alumina.
- Alumina is the primary raw material for aluminum production.
- High-purity alumina is used in ceramic applications.
- The refinery produced thousands of tons of alumina last year.
- Alumina powder is mixed with other materials to create abrasives.
- The chemical formula for alumina is Al2O3.