Alumina

n.

1.

(Chem.) One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.

Noun

1.

alumina - any of various forms of aluminum oxide occurring naturally as corundum Synonyms: aluminium oxide, aluminum oxide

aluminium oxide, aluminum oxide, alundum, corundom, corundum, furnace lining, refractory