corundum
co·run·dum
noun \kə-ˈrən-dəm\Definition of CORUNDUM
: a very hard mineral that consists of aluminum oxide occurring in massive and crystalline forms, that can be synthesized, and that is used for gemstones (as ruby and sapphire) and as an abrasive
See Origin of CORUNDUM
Tamil kuruntam; akin to Sanskrit kuruvinda ruby
First Known Use: 1804
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