from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Aluminum oxide used especially in mining, material sciences and ceramics.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.

from The Century Dictionary and Cyclopedia

  • n. The oxid of aluminium, Al2O3, the most abundant of the earths.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of various forms of aluminum oxide occurring naturally as corundum


New Latin alūmina, from Latin alūmen, alūmin-, alum.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From (combining form of) Latin alumen + -a. (Wiktionary)



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