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

 

fermium

 noun
noun
BrE BrE//ˈfɜːmiəm//
 
; NAmE NAmE//ˈfɜːrmiəm//
 
[uncountable](symbol Fm)
 
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a chemical element. Fermium is a very rare radioactive metal. Word Origin 1950s: from the name of E. Fermi (1901-1954), Italian-born American atomic physicist + -ium.
See the Oxford Advanced American Dictionary entry: fermium