aluminum oxide

noun
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American Heritage
Science Dictionary
aluminum oxide  
See alumina.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They arranged concentric layers of silver and aluminum oxide into a half
  cylinder and carved tightly spaced lines on the inside.
One of these is barium oxide, something with a half-life and, aluminum oxide as
  well.
Rubies are formed of a mineral called corundum, comprised of aluminum oxide.
Alumina, or synthetic aluminum oxide, is used in the smelting of aluminum.
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