actinium
A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.
A kind of
- chemical element
Word history
From French "actinium".
Where this comes from
This definition is adapted from “actinium” 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.