megahex

noun2

1. •
   A regular, quasi-circular polygon made up of multiple hexagons used to indicate a different scale, range, or area of effect on a hexagonal grid. Commonly used on maps for some tabletop war games and roleplaying games.

   • All creatures within five megahexes of the wizard will be thrown to the ground, and take one hit damage from cuts, bruises, and contusions. — 1979
2. •
   (rare) An irregular grouping of hexagons indicating a single area on hexagon-based game map.

   • There's one irregular and over-sized "mega hex" on the map: the "Shobu Group Base Area" in west-central Luzon. — 2018