🇫🇷French Source WordCode: FR

césium

Pronunciation / Transliteration: sezjɔm

🇬🇧 Direct English Meaning:
Caesium/ˈsiː.zi.əm/
nounCEFR C1 (Advanced)Top #8500 frequency
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🇫🇷 Example Sentence in French:

"Le césium est utilisé dans les horloges atomiques."

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.

    "Caesium is widely used in atomic clocks due to its precise frequency standards."
  2. 2

    The chemical element of atomic number 55, designated by the symbol Cs.

    "Researchers isolated a radioactive isotope of caesium from the sample."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Latin caesius, meaning 'sky-blue' or 'bluish-grey', reflecting the bright blue lines in its emission spectrum. It was discovered spectroscopically in 1860 by German chemists Robert Bunsen and Gustav Kirchhoff.

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