a. See Vehmic. [ 1913 Webster ]
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. any particle that obeys Fermi-Dirac statistcs and is subject to the Pauli exclusion principle. [ WordNet 1.5 ]
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.