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

 

barium

 noun
noun
BrE BrE//ˈbeəriəm//
 
; NAmE NAmE//ˈberiəm//
 
[uncountable](symbol Ba)
 
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a chemical element. Barium is a soft silver-white metal Word Origin early 19th cent.: from baryta, barium hydroxide + -ium.
See the Oxford Advanced American Dictionary entry: barium

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