cesium 133

noun

Definition of cesium 133

: an isotope of cesium used especially in atomic clocks and one of whose atomic transitions is used as a scientific time standard

First Known Use of cesium 133

1966, in the meaning defined above

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The first known use of cesium 133 was in 1966

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Cite this Entry

“Cesium 133.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cesium%20133. Accessed 1 Oct. 2020.

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