: a metallic chemical element that is the most electropositive element known and that is used in photoelectric cells, in atomic clocks, and as a component of drilling fluid see Chemical Elements Table
Examples of cesium in a Sentence
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Nuclear energy is generated by splitting uranium, leaving behind dangerous radioactive products, such as cesium and strontium, that must be isolated for centuries.
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Ernest Moniz, Foreign Affairs, 17 Oct. 2011
Much of the work so far uses rubidium and cesium atoms, but the physicist Jeff Thompson at Princeton University prefers encoding the information in the nuclear spin states of metal atoms such as strontium and ytterbium, which have even longer coherence times.
—Philip Ball, Quanta Magazine, 25 Mar. 2024
So, in 1955, scientists started measuring seconds using the resonance of cesium atoms, a more stable timekeeping method.
—Will Sullivan, Smithsonian Magazine, 29 Mar. 2024
In 1955, physicist Louis Essen created an atomic clock based on the oscillation of cesium atoms.
—Markus Lutz, Forbes, 20 Feb. 2024
See all Example Sentences for cesium 
Ernest Moniz, Foreign Affairs, 17 Oct. 2011
Much of the work so far uses rubidium and cesium atoms, but the physicist Jeff Thompson at Princeton University prefers encoding the information in the nuclear spin states of metal atoms such as strontium and ytterbium, which have even longer coherence times.
—Philip Ball, Quanta Magazine, 25 Mar. 2024
So, in 1955, scientists started measuring seconds using the resonance of cesium atoms, a more stable timekeeping method.
—Will Sullivan, Smithsonian Magazine, 29 Mar. 2024
In 1955, physicist Louis Essen created an atomic clock based on the oscillation of cesium atoms.
—Markus Lutz, Forbes, 20 Feb. 2024
See all Example Sentences for cesium
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“Cesium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cesium. Accessed 9 Sep. 2024.
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Medical Definition
cesium
noun
ce·si·um
variants
or chiefly British caesium
: a silver-white soft ductile element of the alkali metal group that is the most electropositive element known and that is used especially in photoelectric cells
—symbol Cs
see Chemical Elements Table
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