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doc Definition of corundum
    English to English
    noun
  • very hard mineral used as an abrasive
  • source: WordNet 3.0
  • The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.
  • source: Webster 1913
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