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  1. alumina

    • IPA[əˈlo͞omənə]


    • n.
      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.
    • noun: alumina

    • 更多解釋
    • IPA[əˈl(j)uːmɪnə]


    • n.
      a white solid that is a major constituent of many rocks, especially clays, and is found ...

    Oxford Dictionary