noun
- A soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal.
- synonyms: caesium, Cs, atomic number 55
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| APA | WordNet. (2010). Cesium. Retrieved September 20, 2026, from http://smartdefine.org/cesium/definitions/1247623 |
| Chicago | WordNet. 2010. "Cesium" http://smartdefine.org/cesium/definitions/1247623 (accessed September 20, 2026). |
| Harvard | WordNet 2010, Cesium, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/cesium/definitions/1247623>. |
| MLA | WordNet. "Cesium" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/cesium/definitions/1247623> |