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gadfly

gad·fly

gadfly

 
pronunciation:
gaed flaI
part of speech: noun
inflections: gadflies
definition 1: any of various flies, such as the horsefly or botfly, that bite and pester livestock.
The horse swished its tail to shoo the gadflies.
definition 2: a persistent critic, esp. of established institutions and policies.
He has become a gadfly of the genetically modified food industry, making regular appearances on television to warn of the health and environmental risks.
definition 3: an annoying, insistent pest.