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alumina
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English Dictionary: alumina by the DICT Development Group
2 results for alumina
From WordNet (r) 3.0 (2006) [wn]:
alumina
n
  1. any of various forms of aluminum oxide occurring naturally as corundum
    Synonym(s): alumina, aluminum oxide, aluminium oxide
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Alumina \A*lu"mi*na\, n. [L. alumen, aluminis. See {Alum}.]
      (Chem.)
      One of the earths, consisting of two parts of aluminium and
      three of oxygen, {Al2O3}.
  
      Note: It is the oxide of the metal aluminium, the base of
               aluminous salts, a constituent of a large part of the
               earthy siliceous minerals, as the feldspars, micas,
               scapolites, etc., and the characterizing ingredient of
               common clay, in which it exists as an impure silicate
               with water, resulting from the decomposition of other
               aluminous minerals. In its natural state, it is the
               mineral corundum.
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