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1. (n.) cesium
a rare highly reactive soft metallic element of the alkali metal group used chiefly in photoelectric cells.
Etymology: (1861; < L caesium, neut. of caesius bluish gray (see -ium2); so named from the blue lines in its spectrum)
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| Definition of 'cesium' |
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 'cesium' |
U.S. National Library of Medicine |
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1. cesium
A member of the alkali metals. It has an atomic symbol Cs, atomic number 50, and atomic weight 132.91. Cesium has many industrial applications, including the construction of atomic clocks based on its atomic vibrational frequency.
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Definitions of cesium 
