Hypertext Webster Gateway: "Caesium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Caesium \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.
From WordNet (r) 1.7 (wn)
caesium
n : a soft silver-white ductile metallic element (liquid at
normal temperatures); the most electropositive and
alkaline metal [syn: {cesium}, {Cs}, {atomic number 55}]
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