|noun|
1.A fly that bites livestock, especially a horsefly, warble fly, or botfly.
‘Later, Hera sent the notorious _gadfly_ to continuously bite and irritate Io.’
‘She was tormented by a furious little _gadfly_ that bit her mercilessly, though she flicked her tail this way and that.’
2.A person who annoys or criticizes others in order to provoke them into action.
‘always a _gadfly_ , he attacked intellectual orthodoxies’
‘We need to encourage new and daring defenders of science, _gadflies_ in the name of critical inquiry; interpreters able to extend the public’s understanding of science and its methods.’
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