| NOUN | substance | caesium, cesium, Cs, atomic number 55 | a soft silver-white ductile metallic element (liquid / liquid at normal temperatures) |
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| Meaning | A soft silver-white ductile metallic element (liquid / liquid at normal temperatures); the most electropositive and alkaline metal. | |
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| Synonyms | cesium, Cs, atomic number 55 | |
| Narrower | cesium 137 | A radioactive isotope of cesium used in radiation therapy |
| Broader | metallic element, metal | Any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
| Substance of | pollucite | A rare mineral that is an important source of cesium |
| Spanish | cesio, Cs, número atómico 55 | |
| Catalan | cesi, Cs, número atòmic 55 | |
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