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Bible Dictionaries
Corundum

Webster's Dictionary

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(n.) 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.

Bibliography Information
Webster, Noah. Entry for 'Corundum'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​c/corundum.html. 1828.
 
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