Gadfly From Wikipedia, the free encyclopedia Jump to: navigation, search Look up Gadfly in Wiktionary, the free dictionary.Gadfly can refer to: Gadfly, a type of fly typically belonging to either the family Tabanidae (Horse-fly) or Oestridae (Botfly) <a href="http://en.wikipedia.org/wiki/Gadfly" target="_blank">http://en.wikipedia.org/wiki/Gadfly</a>