gadfly

[ gad-flahy ]
/ ˈgædˌflaɪ /

noun, plural gad·flies.

any of various flies, as a stable fly or warble fly, that bite or annoy domestic animals.
a person who persistently annoys or provokes others with criticism, schemes, ideas, demands, requests, etc.

Origin of gadfly

First recorded in 1585–95; gad2 + fly2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gadfly

British Dictionary definitions for gadfly

gadfly
/ (ˈɡædˌflaɪ) /

noun plural -flies

any of various large dipterous flies, esp the horsefly, that annoy livestock by sucking their blood
a constantly irritating or harassing person

Word Origin for gadfly

C16: from gad ² (sting) + fly ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012