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noun. common mineral - aluminum oxide; notable for its hardness; transparent varieties as sapphire and ruby are used as gems other varieties as abrasives often made synthetically
Corundum is used as an abrasive and also as a gemstone.
Corundum is used as an abrasive and also as a gemstone.
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hard mineral; aluminum oxide; ruby; sapphire
hydrogen
3 syllables
co-run-dum
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