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From Longman Dictionary of Contemporary English
Related topics: Elements
caesiumcae‧si‧um British English, cesium American English /ˈsiːziəm/ noun [uncountable]  a soft silver-white metal that is used in photoelectric cells. It is a chemical element: symbol Cs
Examples from the Corpus
caesiumIt had a caesium 137 concentration of only 4 becquerels per kilogram.The best caesium clocks achieve a fractional accuracy and stability of between 10 -13; and 10 -14;.The study stresses that the levels of caesium observed do not pose any risk to health.The caesium chloride lattice is thus said to have 8:8 coordination.The caesium chloride structure, for example, consists of a cubic structure of cations and a cubic structure of anions.
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