Definition of alumina in English:


Syllabification: a·lu·mi·na
Pronunciation: /əˈlo͞omənə


  • A white solid, aluminum oxide, that occurs in bauxite and is found in crystalline form as the main constituent of corundum, sapphire, and other minerals.
    • Aluminum oxide; chemical formula: Al2O3
    More example sentences
    • The silica, alumina, and iron come from sand, clay, and iron ore.
    • The major exports are bauxite, alumina, gold, and diamonds.
    • Already some sites yield little more than a mass of crystallised aluminium oxide.


late 18th century: from Latin alumen (see alum1), on the pattern of words such as magnesia.

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