Definition of Caeseum
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.
- Webster's Unabridged Dictionary (1913)
- a metallic chemical element (symbol Cs) with an atomic number of 55.
- The Nuttall Encyclopedia
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The correct Spelling of this word is: Caesium
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