Alumina

ahd-5
  • noun. 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.
    • The Century Dictionary and Cyclopedia
  • noun. The oxid of aluminium, Al2O3, the most abundant of the earths.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. Aluminum oxide used especially in mining, material sciences and ceramics.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. any of various forms of aluminum oxide occurring naturally as corundum
    • Word Usage
    "Alcoa is also expected to benefit from the rise in alumina, a key raw material that is used to make aluminum."
    Form
    alumian  aluminate  aluminium  
    Hypernym
    Words that are more generic or abstract
    corundom  corundum  
    Hyponym
    Words that are more specific
    alundum  
    Same Context
    Words that are found in similar contexts
    alum  apatite  bismuth  borate  boron  
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