Definitions

1. noun

A white or colourless crystalline solid, a compound of aluminium and oxygen, used in the manufacture of abrasives, ceramics, and refractory materials.

“The production of alumina requires a high-temperature process.”

2. chemistry

A chemical compound, aluminium oxide (Al2O3), occurring naturally as corundum or formed synthetically.

“Alumina is a major component in the production of aluminium metal.”