fratriarchy

noun3

1. •
   A social system in which power is held by brothers.

   • This last problem received rather less attention than the previous three. a) The nature of family Koschaker perceived the family at Nuzi as a patriarchal one with vestigious remains of fratriarchy. — 1988
2. •
   A power structure in which a fraternal group of men are dominant.
3. •
   A hierarchical or discriminatory fraternity or fraternal interest group.

   • In the second section I examine surf lifesaving and surfing as fratriarchies, or brotherhoods, in which members bond through physical rites, intimidation, violence and denigrating women (Loy 1995). — 2011