superhero, n. 1. in general usage, a fictional hero having extraordinary or superhuman powers; usu. refers to pulp comic book characters. 2. a role-playing game milieu based on pulp comic book scenarios, usu. involving super-powered heroes battling super-powered villains; may have strong science fiction elements. [GJ1]
Addendum: Superhero games include Hero Games' Champions and Hero System, TSR's Marvel Super Heroes, and SJG's GURPS Supers. [EDE, error corrected by FH]