CAESIUM

cesium, caesium, Cs, atomic number

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

Source: WordNet® 3.1

Etymology

Noun

caesium (uncountable)

The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.

Anagrams

• aeciums, æciums

Source: Wiktionary

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