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Definitions of cesium
  1. noun
    a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
Definition that contains cesium
  • cesium 137 a radioactive isotope of cesium used in radiation therapy
  • pollucite a rare mineral that is an important source of cesium
  • alkali metal any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
  • alkaline metal any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
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