The Collaborative International Dictionary of English v.0.48:

Gurnard \Gur"nard\, Gurnet \Gur"net\n. [OF. gornal, gournal,
   gornart, perh. akin to F. grogner to grunt; cf. Ir. guirnead
   gurnard.] (Zool.)
   One ofseveral European marine fishes, of the genus Trigla
   and allied genera, having a large and spiny head, with mailed
   cheeks. Some of the species are highly esteemed for food. The
   name is sometimes applied to the American sea robins.
   [Written also gournet.]
   [1913 Webster]

   Plyling gurnard. See under Flying.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gurnard
    n 1: bottom-dwelling coastal fishes with spiny armored heads and
         fingerlike pectoral fins used for crawling along the sea
         bottom