Source : Webster's Revised Unabridged Dictionary (1913)

Goby \Go"by\, n.; pl. {Gobies}. [F. gobie, L. gobius, gobio, Gr.
   ? Cf. {Gudgeon}.] (Zo["o]l.)
   One of several species of small marine fishes of the genus
   {Gobius} and allied genera.

Source : WordNet®

goby
     n : small spiny-finned fish of coastal or brackish waters having
         a large head and elongated tapering body having the
         ventral fins modified as a sucker [syn: {gudgeon}]