Definition of gadfly

Definition of gadfly
  1. gadfly Noun Any dipterous insect of the genus Oestrus, and allied group of botflies.
  2. gadfly Noun A horsefly: any of various species of fly, of the family Tabanid[ae], noted for buzzing about animals and sucking their blood.
  3. gadfly Noun One who upsets the status quo by posing upsetting or novel questions, or attempts to stimulate innovation by proving an irritant.
  4. gadfly Noun One who merely irritates without making useful suggestions.
  5. gadfly Noun A bloodsucker
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