Corundum

Pronunciation

• UK IPA: /kəˈrÊŒn.dÉ™m/

Origin

From Tamil குருந்தம் (kuruntam, "ruby").

Full definition of corundum

Noun

1. (mineral) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.