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1. (n.) fermium
a transuranic element, artificially produced from plutonium or uranium.
Etymology: (1950–55; after E. Fermi ; see -ium2)
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| Definition of 'fermium' |
Princeton's WordNet |
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1. (noun) fermium, Fm, atomic number 100
a radioactive transuranic metallic element produced by bombarding plutonium with neutrons
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| Definition of 'fermium' |
U.S. National Library of Medicine |
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1. fermium
Fermium. A man-made radioactive actinide with atomic symbol Fm, atomic number 100, and atomic weight 257. Its known isotopes range from 244-254 and 256-258. Its valence can be +2 or +3. Like einsteinium, it was discovered in 1952 in the debris from a thermonuclear explosion.
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Definitions of fermium 
