noun
- A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands.
- synonyms: Th, atomic number 90
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). Thorium. Retrieved September 20, 2026, from http://smartdefine.org/thorium/definitions/1247704 |
| Chicago | WordNet. 2010. "Thorium" http://smartdefine.org/thorium/definitions/1247704 (accessed September 20, 2026). |
| Harvard | WordNet 2010, Thorium, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/thorium/definitions/1247704>. |
| MLA | WordNet. "Thorium" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/thorium/definitions/1247704> |