Found 2 items, similar to caesium.
English → English (WordNet) Definition: caesium caesium n : a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal [syn: cesium, Cs, atomic number 55]
English → English (gcide) Definition: caesium caesium \caesium\, Caesium \C[ae]"si*um\, n. [NL., from L. caesius bluish gray.] (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 number 55. Atomic weight 132.6. Syn: cesium, Cs [1913 Webster]