Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Latin
Origin: caesius 'bluish grey'

caesium

 noun
     
Related topics: Elements
cae‧si‧um British English ; cesium American English [uncountable]
a soft silver-white metal that is used in photoelectric cells. It is a chemical element: symbol Cs
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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