Definitions for: Caesium

[n] a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

Webster (1913) Definition: 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 weight 132.6.

Synonyms: atomic number 55, cesium, Cs

See Also: cesium 137, metal, metallic element, pollucite

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