- noun a white aluminium oxide used in catalysts, abrasives and the manufacture of artificial rubies and sapphires.
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- noun a form of aluminium oxide used as substrate for ceramic catalysts
- A chemical compound whose formula is Al2O3. It is a refractory material, and its applications in electronics include its use as an insulator, in the adsorbance of gases, in the manufacturing of chips, and as an abrasive. Also called aluminum oxide.