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gadfly

[gad-flahy] /ˈgædˌflaɪ/
noun, plural gadflies.
1.
any of various flies, as a stable fly or warble fly, that bite or annoy domestic animals.
2.
a person who persistently annoys or provokes others with criticism, schemes, ideas, demands, requests, etc.
Origin
1585-1595
1585-95; gad2 + fly2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gad fly

gadfly

/ˈɡædˌflaɪ/
noun (pl) -flies
1.
any of various large dipterous flies, esp the horsefly, that annoy livestock by sucking their blood
2.
a constantly irritating or harassing person
Word Origin
C16: from gad² (sting) + fly²
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
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Word Origin and History for gad fly
gadfly
1620s, "fly which bites cattle," probably from gad "goad, metal rod" (early 13c.), here in the sense of "stinger," from O.N. gaddr "spike, nail," from P.Gmc. *gadaz "pointed stick;" but sense is entangled with gad (v.) and an early meaning of gadfly was also "someone who likes to go about, often stopping here and there." Sense of "one who irritates another" is from 1640s (equivalent of L. oestrus).
Online Etymology Dictionary, © 2010 Douglas Harper
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