Gadfly

n.

1.

(Zool.) Any dipterous insect of the genus Oestrus, and allied genera of botflies. Gadfly petrel (Zool.) one of several small petrels of the genus Oestrelata.

Noun	1.	gadfly - a persistently annoying person Synonyms: blighter, cuss, pest, pesterer
	2.	gadfly - any of various large flies that annoy livestock

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