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Definisi 'corundum'
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English to English noun
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very hard mineral used as an abrasive |  | source: wordnet30
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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: webster1913
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