Source : Webster's Revised Unabridged Dictionary (1913)

Dracunculus \Dra*cun"cu*lus\, n.; pl. {Dracunculi}. [L., dim. of
   draco dragon.] (Zo["o]l.)
   (a) A fish; the dragonet.
   (b) The Guinea worm ({Filaria medinensis}).