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Definition of cesium
: 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 — see element table
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Recent Examples of cesium from the Web
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Around the same time, the first accurate atomic clocks were being developed that used cesium.
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The city of Soma last year set up municipal incinerators specially designed to burn carcasses and filter out radioactive cesium.
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Leap seconds are used to fill in the gap and make Earth’s observed speed align with our most accurate clocks—atomic devices that define a second by measuring the regular decay of radioactive elements such as cesium.
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Stuhlinger wrote that cesium would make a more efficient propellant than rubidium.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cesium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of cesium
New Latin, from Latin caesius bluish gray
Medical Dictionary
cesium
Medical Definition of cesium
: 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 element table
Learn More about cesium
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Spanish Central: Translation of cesium Nglish: Translation of cesium for Spanish speakers Britannica.com: Encyclopedia article about cesium
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