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alumina

[uh-loo-muh-nuh] /əˈlu mə nə/
noun
1.
the natural or synthetic oxide of aluminum, Al 2 O 3 , occurring in nature in a pure crystal form as corundum.
Also called aluminum oxide.
Origin
1780-1790
1780-90; < Latin alūmin-, stem of alūmen alum1 + -a4
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for alumina
  • The pozzolanic mortar used had a high content of alumina and silica.
  • alumina, grain, gypsum, logs and wood chips, for instance, are bulk cargoes.
British Dictionary definitions for alumina

alumina

/əˈluːmɪnə/
noun
1.
another name for aluminium oxide
Word Origin
C18: from New Latin, plural of Latin alūmenalum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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alumina in Science
alumina
  (ə-l'mə-nə)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for alumina

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.

Learn more about alumina with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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