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Definitions of corundum
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.
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.
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.
A mineral of extreme hardness, consisting of nearly pure alumina. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
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.
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