(n) Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954), Syn.Enrico Fermi
(n) (physics) law obeyed by a systems of particles whose wave function changes when two particles are interchanged (the Pauli exclusion principle applies)
n. [ OF., dim. of fermeil, fermail, clasp, prob. fr. OF. & F. fermer to make fast, fr. ferme fast. See Firm. ] A buckle or clasp. [ Obs. ] Donne. [ 1913 Webster ]
n. the transuranic element of atomic number 100; symbol Fm. The atomic weight of the most stable isotope, having a half-life of about 80 days, is 257. The first isotope, Fm255 was discovered in 1952 in the debris of a thermonuclear explosion. Other istopes have been produced in nuclear reactors and by decay of other transuranic elements. Handb. Ch. Phys. 61. Syn. -- Fm. [ WordNet 1.5 ]
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