Etymology
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caesium (n.)

see cesium.

updated on December 16, 2012

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Definitions of caesium from WordNet

caesium (n.)
a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal;
Synonyms: cesium / Cs / atomic number "
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.