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

 

caesium

 noun
(British English)(North American English cesium)noun
BrE BrE//ˈsiːziəm//
 
; NAmE NAmE//ˈsiːziəm//
 
[uncountable](symbol Cs)
 
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a chemical element. Caesium is a soft silver-white metal that reacts strongly in water, used in photoelectric cells. Word Origin mid 19th cent.: from Latin caesius ‘greyish-blue’ (because it has characteristic lines in the blue part of the spectrum).

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