gadfly

from WordNet (r) 3.0 (2006)
gadfly
    n 1: a persistently annoying person [syn: {pest}, {blighter},
         {cuss}, {pesterer}, {gadfly}]
    2: any of various large flies that annoy livestock
    
from The Collaborative International Dictionary of English v.0.48
Gadfly \Gad"fly`\ (g[a^]d"fl[imac]`), n.; pl. {Gadflies}. [Gad +
   fly.] (Zool.)
   Any dipterous insect of the genus {Oestrus}, and allied
   genera of botflies.
   [1913 Webster]

   Note: The sheep gadfly ({Oestrus ovis}) deposits its young in
         the nostrils of sheep, and the larv[ae] develop in the
         frontal sinuses. The common species which infests
         cattle ({Hypoderma bovis}) deposits its eggs upon or in
         the skin where the larv[ae] or bots live and produce
         sores called wormels. The gadflies of the horse produce
         the intestinal parasites called bots. See {Botfly}, and
         {Bots}. The true horseflies are often erroneously
         called gadflies, and the true gadflies are sometimes
         incorrectly called {breeze flies}.
         [1913 Webster]

   {Gadfly petrel} (Zool.), one of several small petrels of the
      genus {Oestrelata}.
      [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
Breeze \Breeze\, Breeze fly \Breeze" fly`\, n. [OE. brese, AS.
   bri['o]sa; perh. akin to OHG. brimissa, G. breme, bremse, D.
   brems, which are akin to G. brummen to growl, buzz, grumble,
   L. fremere to murmur; cf. G. brausen, Sw. brusa, Dan. bruse,
   to roar, rush.] (Zool.)
   A fly of various species, of the family {Tabanid[ae]}, noted
   for buzzing about animals, and tormenting them by sucking
   their blood; -- called also {horsefly}, and {gadfly}. They
   are among the largest of two-winged or dipterous insects. The
   name is also given to different species of botflies. [Written
   also {breese} and {brize}.]
   [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
36 Moby Thesaurus words for "gadfly":
      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

    

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