| Definition of 'caesium' |
Princeton's WordNet |
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1. (noun) cesium, caesium, Cs, atomic number 55
a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
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| Definition of 'caesium' |
Webster Dictionary |
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1. (noun) caesium
a rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6
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Definitions of caesium 
