caesium Meaning, Definition & Usage
-
noun a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
cesium; Cs; atomic number 55.
WordNet
Cæ"si*um noun
(Also<
- Caesium
- Cæsium
)
Etymology
NL., from L.Definitions
(Chem.) 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.