CAESIUMS

CAESIUM

Cæ"si*um, n. Etym: [NL., from L. caesius bluish gray.] (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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