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

 

beryllium

 noun
noun
BrE BrE//bəˈrɪliəm//
 
; NAmE NAmE//bəˈrɪliəm//
 
[uncountable](symbol Be)
 
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a chemical element. Beryllium is a hard grey metal found mainly in the mineral beryl. Word Origin mid 19th cent.: from beryl (from which it is derived) + -ium.
See the Oxford Advanced American Dictionary entry: beryllium