The Collaborative International Dictionary of English v.0.48:

Goby \Go"by\, n.; pl. Gobies. [F. gobie, L. gobius, gobio, Gr.
   ? Cf. Gudgeon.] (Zool.)
   One of several species of small marine fishes of the genus
   Gobius and allied genera.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Go-by \Go"-by`\, n.
   A passing without notice; intentional neglect; thrusting
   away; a shifting off; adieu; as, to give a proposal the
   go-by.
   [1913 Webster]

         Some songs to which we have given the go-by. --Prof.
                                                  Wilson.
   [1913 Webster] gocart

WordNet (r) 3.0 (2006):

goby
    n 1: 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: goby, gudgeon]