Definition of alumina in English:

alumina

Line breaks: alu|mina
Pronunciation: /əˈluːmɪnə
 
/

noun

[mass noun]
  • A white solid that is a major constituent of many rocks, especially clays, and is found crystallized as corundum, sapphire, and other minerals.
    • Alternative name: aluminium 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.

Origin

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

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