Cæ″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 weight 132.6.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.