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caesium

From Wiktionary
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The Simple English Wikipedia has an article on:

xenon 55 barium

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Noun

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Singular
caesium

Plural
none

Caesium.
  1. (uncountable) Caesium is a chemical element that is a very soft silver-gold coloured alkali metal with the atomic number 55 and the symbol Cs.
    The atomic clock uses caesium to keep accurate time.