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



(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 Originmid 19th cent.: from Latin caesius ‘greyish-blue’ (because it has characteristic lines in the blue part of the spectrum).

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