DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tuna
       n 1: tropical American prickly pear of Jamaica [syn: tuna,
            Opuntia tuna]
       2: important warm-water fatty fish of the genus Thunnus of the
          family Scombridae; usually served as steaks [syn: tuna,
          tuna fish, tunny]
       3: any very large marine food and game fish of the genus
          Thunnus; related to mackerel; chiefly of warm waters [syn:
          tuna, tunny]
       4: New Zealand eel [syn: tuna, Anguilla sucklandii]