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fermium (n.)

radioactive element, discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for Italian-born U.S. physicist Enrico Fermi (1901-1954). With metallic element ending -ium.

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Definitions of fermium from WordNet

fermium (n.)
a radioactive transuranic metallic element produced by bombarding plutonium with neutrons;
Synonyms: Fm / atomic number "
From wordnet.princeton.edu