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Caesium
//ˈsiːzi.əm// noun
Definitions
Noun
- 1 The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal. uncountable
- 2 a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal wordnet
Etymology
From Latin caesius (“sky-blue”), in reference to the radiation spectra, + -ium.
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