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a•lu•mi•na(əˈlu mə nə)
the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum.
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|Noun||1.||aluminum oxide - any of various forms of aluminum oxide occurring naturally as corundum|
furnace lining, refractory - lining consisting of material with a high melting point; used to line the inside walls of a furnace
alundum - a substance made of fused alumina