alumina /əˈluːmɪnə/

a

I. noun [ mass noun]

1. 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; chem. formula: Al2O3.
– origin late 18th cent.: from Latin alumen (see alum), on the pattern of words such as magnesia.

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