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Related to alumina: Activated alumina
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) another name for aluminium oxide
[C18: from New Latin, plural of Latin alūmen alum]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a•lu•mi•na(əˈlu mə nə)
the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum.
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|Noun||1.||alumina - any of various forms of aluminum oxide occurring naturally as corundum|
furnace lining, refractory - lining consisting of material with a high melting point; used to line the inside walls of a furnace
alundum - a substance made of fused alumina
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