noun (plural: gadflies)
- Any dipterous insect of the genus Oestrus, and allied group of botfly, botflies.
- A fly of various species, of the family Tabanidae, noted for buzzing about animals and sucking their blood.
- A horsefly.
- One who upsets the status quo by posing upsetting or novel questions, or attempt to stimulate innovation by proving an irritant wikipedia:gadfly (social), see Wikipedia.
- (slang) A bloodsucker
- He's a regular and takes advantage of his friend's generosity.
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Full Definition of gadfly