Definition that contains corundum
- ruby a transparent deep red variety of corundum; used as a gemstone and in lasers
- emery a hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper)
- sapphire a precious transparent stone of rich blue corundum valued as a gemstone
- aluminium oxide any of various forms of aluminum oxide occurring naturally as corundum
- alumina any of various forms of aluminum oxide occurring naturally as corundum
- aluminum oxide any of various forms of aluminum oxide occurring naturally as corundum