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fermium

noun

fer·​mi·​um ˈfer-mē-əm How to pronounce fermium (audio) ˈfər- How to pronounce fermium (audio)
: a radioactive metallic element produced artificially (as by bombardment of plutonium with neutrons) see Chemical Elements Table

Example Sentences

Recent Examples on the Web The golden ratio is the metallic mean between 1 and 2, the silver ratio represents the metallic mean between 2 and 3, and so forth, all the way to the fermium ratio (between 100 and 101—I just used the matching chemical element) and beyond. Caroline Delbert, Popular Mechanics, 30 Jan. 2020

Word History

Etymology

Enrico Fermi

First Known Use

1955, in the meaning defined above

Time Traveler
The first known use of fermium was in 1955

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