corundum
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.
A kind of
- mineral
Kinds of corundum
- alumina
- ruby
- sapphire
Related words
- alundum
- silundum
- carborundum
Where this comes from
This definition is adapted from “corundum” on Wiktionary, by its contributors; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.