单词 | alumina |
释义 | a·lu·mi·na (ə-lmə-nə) n. Any of several forms of aluminum oxide, Al2O3, occurring naturally as corundum, in a hydrated form in bauxite, and with various impurities as ruby, sapphire, and emery, used in aluminum production and in abrasives, refractories, ceramics, and electrical insulation. Also called aluminum oxide. [New Latin alūmina, from Latin alūmen, alūmin-, alum.] |
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