pannage

The right to turn pigs into a forest in autumn to feed on beechmast and acorns — a way of sweeping the forest floor of early green acorns that would poison cattle or deer. The rights of pannage still exist in the New Forest, a national park in Hampshire, southern England, originally set aside as royal hunting grounds by William the Conqueror around 1079. It’s one of the largest remaining tracts of unenclosed pasture, woodland, and heath in England, and it’s still home to ancient commoners’ rights. The word names both the practice and the legal right to practice it.