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1. Oxford Dictionary

   alumina

   • IPA[əˈl(j)uːmɪnə]

   英式

   • n.
     a white solid that is a major constituent of many rocks, especially clays, and is found crystallized as corundum, sapphire, and other minerals.

   • noun: alumina

2. • 更多解釋

   alumina

   • IPA[əˈlo͞omənə]

   美式

   • n.
     a white solid, aluminum oxide, that occurs in bauxite and is found in crystalline form as the ...

   Oxford American Dictionary