cae·si·um (s  z- m)n. Variant of cesium. |
caesium US, cesium [ˈsiːzɪəm]
n
(Chemistry / Elements & Compounds) a ductile silvery-white element of the alkali metal group that is the most electropositive metal. It occurs in pollucite and lepidolite and is used in photocells. The radioisotope caesium-137, with a half-life of 30.2 years, is used in radiotherapy. Symbol: Cs; atomic no.: 55; atomic wt.: 132.90543; valency: 1; relative density: 1.873; melting pt.: 28.39±0.01°C; boiling pt.: 671°C
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| Noun | 1. | caesium - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. cesium 137 - a radioactive isotope of cesium used in radiation therapy pollucite - a rare mineral that is an important source of cesium |
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