megahex

• mega hex

mega- +‎ hex, the contracted form of hexagon.

• IPA^(key): /ˈmɛɡəhɛks/

megahex (plural megahexes)

1. (war game) 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.
   • 1979 December, Brad McMilliam, “Some Spells for the Very Smart Sorcerer”, in The Dragon, number 32, page 18:

     All creatures within five megahexes of the wizard will be thrown to the ground, and take one hit damage from cuts, bruises, and contusions.

   • 1980 September-October, Paul King, “Cityfight”, in Phoenix, number 27, pages 7–10:

     To avert this, hexes are grouped into 'sevens' to give large "megahexes", a unit can search it's [sic] own "megahex" or up to two "megahexes" away.

   • 1989 September, Matthew J. Costello, “Neat Stuff”, in Isaac Asimov's Science Fiction‎, volume 13, number 9, page 183:

     If a Walker (fire power 6) shoots at a Rebel Trooper (Armor 2) one megahex away, the Imperial baddie has to roll 6 dice (for the firepower) minus 1 (for the one hex range).

2. (rare) An irregular grouping of hexagons indicating a single area on hexagon-based game map.
   • 2018 April-May, Ty Bomba, “The Luzon Campaign, 1945”, in World at War‎, number 59, page R1:

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