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

 

einsteinium

 noun
noun
BrE BrE//aɪnˈstaɪniəm//
 
; NAmE NAmE//aɪnˈstaɪniəm//
 
[uncountable](symbol Es)
 
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a chemical element. Einsteinium is a radioactive element produced artificially from plutonium and other elements. Word Origin 1950s: from the name of Albert Einstein (1879-1955) + -ium.
See the Oxford Advanced American Dictionary entry: einsteinium