fermium

noun

fer·​mi·​um ˈfer-mē-əm  ˈfər- 

: a radioactive metallic element produced artificially (as by bombardment of plutonium with neutrons) see Chemical Elements Table

Word History

Etymology

Enrico Fermi

First Known Use

1955, in the meaning defined above

Kids Definition

fermium

noun

fer·​mi·​um ˈfer-mē-əm  ˈfər- 

: a radioactive metallic element artificially produced (as by bombardment of plutonium with neutrons) see element

Medical Definition

fermium

noun

fer·​mi·​um ˈfer-mē-əm  ˈfər- 

: a radioactive metallic element artificially produced (as by bombardment of plutonium with neutrons)

—symbol Fm see Chemical Elements Table