• Webster's Revised Unabridged Dictionary
    • n Cæsium (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 number 55. Atomic weight 132.6.
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Webster's Revised Unabridged Dictionary
NL., from L. caesius, bluish gray


In literature:

ARTEMI`SIUM, a promontory N. of Euboea, near which Xerxes lost part of his fleet, 480 B.C.
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
ARTEMI'SIUM, a promontory in Euboea, an island of the Aegean, near which several naval battles between the Greeks and Persians were fought, 480 B.C.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various