noun co·run·dum \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

Origin of CORUNDUM

Tamil kuruntam; akin to Sanskrit kuruvinda ruby
First Known Use: 1804


noun co·run·dum \kə-ˈrən-dəm\   (Medical Dictionary)

Medical Definition of CORUNDUM

:  a very hard mineral Al2O3 that consists of alumina occurring in massive form and as variously colored crystals which include the ruby and sapphire


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