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WORDNET DICTIONARY
CIDE DICTIONARY
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WORDNET DICTIONARY
Noun caesium has 1 sense
- caesium(n = noun.substance) atomic number 55, cesium, cs - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal; is a kind of metal, metallic element
has particulars: cesium 137
CIDE DICTIONARY
caesium, n. [NL., from L. caesius bluish gray.].
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. [1913 Webster]
OXFORD DICTIONARY
caesium, n. (US cesium) a soft silver-white element of the alkali metal group, occurring naturally in a number of minerals, and used in photoelectric cells.
Idiom
caesium clock an atomic clock that uses caesium.
Usage
Symb.: Cs.
Etymology
as CAESIOUS (from its spectrum lines)
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