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Corundum   Listen
noun
Corundum  n.  (pl. corundums)  (Also corindon)  (Min.) 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. Note: The name corundum is sometimes restricted to the non-transparent or coarser kinds. Emery is a dark-colored granular variety, usually admixed with magnetic iron ore.






Collaborative International Dictionary of English 0.48








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Words linked to "Corundum" :   alumina, mineral, ruby, aluminium oxide



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