fer·mi·on 
(fûrmē-ŏn′, fĕr-)
(fûrmē-ŏn′, fĕr-)n.
Any of a class of particles having a spin that is half an odd integer and obeying the exclusion principle, by which no more than one identical particle may occupy the same quantum state. The fermions include the baryons, quarks, and leptons.
[After Enrico Fermi.]
- instigator
- instil
- instill
- instillation
- instiller
- instillment
- instinct
- instinctive
- instinctively
- instinctual
- instinctually
- in stitches
- institute
- instituter
- institution
- institutional
- institutionalism
- institutionalist
- institutionalization
- institutionalize
- institutionally
- institutor
- in stock
- in store
- instr.