Definition of cesium noun from the Oxford Advanced Learner's Dictionary

 

cesium

 
(North American English)
 
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(British English caesium)
BrE BrE//ˈsiːziəm//
 
; NAmE NAmE//ˈsiːziəm//
 
noun [uncountable] (symbol Cs) a chemical element. Cesium is a soft silver-white metal that reacts strongly in water, used in photoelectric cells.
See the Oxford Advanced American Dictionary entry: cesium

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