Caesium meaning

sēzē-əm
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A metallic chemical element (symbol Cs) with an atomic number of 55.
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A radioactive isotope of caesium, 13755Cr, having 55 protons and 82 neutrons and which is formed mainly as a fission product by nuclear fission.
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Origin of caesium

  • Latin caesius (“sky-blue”), in reference to the radiation spectra + -ium

    From Wiktionary