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[see-zee-uh m] /ˈsi zi əm/
noun, Chemistry
1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for caesium
  • caesium is a problem as this dissolves in the fat tissue and stays there.
  • Radioactive caesium, uranium and plutonium are harmful, but do not target any particular organ of the body.
  • caesium is used as a catalyst in the hydrogenation of certain organic compounds.
  • caesium is also used as an internal standard in spectrophotometry.
  • The primary compounds of caesium are caesium chloride and its nitrate.
British Dictionary definitions for caesium


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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for caesium

see cesium.

Online Etymology Dictionary, © 2010 Douglas Harper
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