gadfly

n. bloodsucking fly; (Informal) person who annoys everyone around him (with questions, ideas, plans, requests, etc.)

Gadfly can refer to:Gadfly, a type of fly typically belonging to either the family Tabanidae (Horse-fly) or Oestridae (Botfly)Gadfly (database), a relational database in the Python programming languageThe Gadfly, a novel by Ethel Lilian VoynichGadfly (mythology) sent by Hera to torment Io.The Education Gadfly, the weekly e-bulletin of the Thomas B. Fordham FoundationGadfly petrels, a group of petrels in the genera Bulweria and Pterodroma.Gadfly Records, an independent record labelGadfly (social), a term for people who upset the status quoThe Gadfly Suite, a musical suite by Dmitri Shostakovich for one of the films based on the novel The GadflyGadfly Online, an online and print magazineSA-11 "Gadfly" is the NATO reporting name for a Russian surface-to-air missile system "9K37 Buk"
See more at Wikipedia.org...

Noun
1. a persistently annoying person
(synonym) pest, blighter, cuss, pesterer
(hypernym) tormentor, tormenter, persecutor
(hyponym) nudnik, nudnick
2. any of various large flies that annoy livestock
(hypernym) fly
(hyponym) botfly

(n.)
Any dipterous insect of the genus Oestrus, and allied genera of botflies.
  

Synonyms and related words:
abettor, actuator, animator, cajoler, coax, coaxer, encourager, energizer, firer, gad, galvanizer, goad, impeller, inducer, inspirer, lash, mover, moving spirit, oxgoad, persuader, pleader, prick, prime mover, prod, prompter, rowel, spark, spark plug, sparker, spur, stimulator, sting, tempter, wheedler, whip, whiplash