From The Collaborative International Dictionary of English v.0.48 [gcide]:
caesium \caesium\, Caesium \C[ae]"si*um\(s[=e]"z[-e]*[u^]m), noun [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.
From WordNet (r) 3.0 (2006) [wn]:
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