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🇩🇪German Source WordCode: DE

Cäsium

Pronunciation / Transliteration: /ˈtɛːziʊm/

🇬🇧 Direct English Meaning:
Cesium/ˈsiːziəm/
nounCEFR C1 (Advanced)Top #8500 frequency
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🇩🇪 Example Sentence in German:

"Cäsium ist ein sehr reaktives Alkalimetall."

Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A soft, silvery-gold alkali metal that is liquid at near room temperature and is the most reactive and electropositive of all stable elements.

    "Cesium is widely used in high-precision atomic clocks to define the standard unit of time."
  2. 2

    A radioactive isotope of the metal, specifically cesium-137, utilized in medical radiation therapy and industrial gauging applications.

    "Specialized containment procedures are mandatory when handling radioactive cesium."
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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Latin caesius, meaning 'sky-blue' or 'bluish-grey', referring to the bright blue spectral lines that led to its discovery. It was identified in 1860 by Robert Bunsen and Gustav Kirchhoff using spectrum analysis. The name reflects the characteristic color signature emitted by the element when heated.

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