| Pronunciation: | | 'seezeeum
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 WordNet Dictionary |
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| | Definition: | | [n] a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal |
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| | Synonyms: | | atomic number 55, caesium, Cs |
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| | See Also: | | cesium 137, metal, metallic element, pollucite |
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| Medical Dictionary |
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| | Definition: | | A radioactive isotope used for continuous internal radiotherapy. |
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| Biology Dictionary |
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| | Definition: | | A radioactive alkaline (basic) metal element that becomes liquid at slightly above room temperature; it reacts violently with both water and oxygen, as well as with other substances. |
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