an oxide of aluminum, AlO, present in bauxite and clay and found as different forms of corundum, including emery, sapphires, and rubies
Origin of aluminaModern Latin from Classical Latin alumen (gen. aluminis), alum
Any of several forms of aluminum oxide, Al2O3, occurring naturally as corundum, in a hydrated form in bauxite, and with various impurities as ruby, sapphire, and emery, used in aluminum production and in abrasives, refractories, ceramics, and electrical insulation. Also called aluminum oxide .
Origin of aluminaNew Latin alūmina from Latin alūmen alūmin- alum
From (combining form of) Latin alumen + -a.