Fer·mi-Di·rac statistics 
(fĕr′mē-dĭ-răk)
(fĕr′mē-dĭ-răk)n. (used with a sing. verb)
The statistics used in statistical mechanics to describe the behavior of large numbers of fermions.
[After Enrico FERMI and Paul Adrien Maurice DIRAC, who developed the statistics.]