Cesium Definition

sēzē-əm
noun
A soft, silver-white, ductile, metallic chemical element, one of the alkali metals and the most electropositive of all the elements: it ignites in air, reacts vigorously with water, and is used in photoelectric cells: symbol, Cs; at. no. 55: a radioactive isotope (cesium-137) with a half-life of 30.17 years is produced by fission and is used in cancer research, radiation therapy, etc.
Webster's New World

(US) Alternative spelling of caesium.

Wiktionary
Synonyms:

Origin of Cesium

  • From Latin caesius bluish gray (from its blue spectral lines)

    From American Heritage Dictionary of the English Language, 5th Edition

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