[uh-loo-muh-nuh] 
| the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum. |
| a·lu·mi·na (ə-lōō'mə-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.] |
| aluminum oxide n. See alumina. |
alumina (ə-l 'mə-nə) Pronunciation Key
Any of several forms of aluminum oxide used in aluminum production and in abrasives, refractories, ceramics, and electrical insulation. Alumina occurs naturally as the mineral corundum and, with minor traces of chromium and cobalt, as the minerals ruby and sapphire, respectively. In its hydrated form it also occurs as the rock bauxite. Also called aluminum oxide. Chemical formula: Al2O3. |
| aluminum oxide
See alumina. |
aluminum oxide
synthetically produced aluminum oxide (Al2O3), a white or nearly colourless crystalline substance that is used as a starting material for the smelting of aluminum metal. It also serves as the raw material for a broad range of advanced ceramic products and as an active agent in chemical processing.
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