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Definitions of corundum

  1. very hard mineral used as an abrasive Scrapingweb Dictionary DB
  2. 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. Newage Dictionary DB
  3. An oxide of aluminum, occurring in nature as various minerals such as bauxite, corundum, etc. It is used as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cements and refractories. Medical Dictionary DB
  4. An extremely hard mineral used for polishing, as the sapphire, the ruby, etc. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
  5. Native crystalline aluminum oxide. A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
  6. A crystallized mineral of extreme hardness, consisting of pure alumina, used for polishing gems. The american dictionary of the english language. By Daniel Lyons. Published 1899.
  7. An extremely hard mineral, an oxid of aluminum, of which the inferior varieties are used for polishing and the finely colored as gems. Emery is the granular variety. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  8. A mineral of extreme hardness, consisting of nearly pure alumina. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
  9. The hardest known mineral except the diamond, generally of a greyish or greenish-brown tint, used for polishing steel and cutting gems. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  10. The mineral alumina (Al2O3), as found native in a crystalline state. Transparent varieties are used as gemstones, 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. dictgcide_fs
  11. ko-run'dum, n. a mineral consisting of mere alumina, yet of great specific gravity--about four times that of water--and second in hardness only to the diamond. [Hind. kurund.] gutenberg.org/ebooks/37683
  12. Crystallized mineral of same species as sapphire& ruby, blue, grey, brown, black; mineral species of crystallized alumina. Concise Oxford Dictionary
  13. A crystalline mineral of the same species as the ruby; very hard in texture, used for polishing steel. Appleton's medical dictionary.
  14. [Hind.] (Mitt.) Sometimes termed Adamantine spar; a mineral, crystallized or massive, of alumina, nearly pure; the hardest known substance next to the diamond. Tinted varieties of precious C. are sapphire and ruby. China, India, America, etc. Glossary of terms and phrases - Percy
  15. n. [Hindi] The earth alumina, as found native in a crystalline state; adamantine spar Cabinet Dictionary

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