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Word of the Day Tuesday, June 9, 2026

caesium

/ˈsiːziəm/ noun · British & US
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What does caesium mean?

noun

A soft silvery-white alkali metal with an atomic number of 55, used in atomic clocks and as a source of radiation in medical and industrial applications.

Example

"The scientist used caesium to calibrate the atomic clock, ensuring its accuracy."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for caesium

Rhymes with caesium

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