Source : Webster's Revised Unabridged Dictionary (1913)

Barracuda \Bar`ra*cu"da\, n. [Native name.]
   Any of several voracious pikelike marine fishes allied to the
   gray mullets, constituting the genus {Sphyr[ae]na} and family
   {Sphyr[ae]nid[ae]}. The great barracuda ({S. barracuda}) of
   the West Indies, Florida, etc., is often six feet or more
   long, and as dangerous as a shark. In Cuba its flesh is
   reputed to be poisonous. {S. Argentea} of the Pacific coast
   and {S. sphyr[ae]na} of Europe are smaller species, and are
   used as food.

Barracuda \Bar`ra*cu"da\, Barracouata \Bar`ra*cou"ata\, n.
   1. (Zo["o]l.) A voracious pikelike, marine fish, of the genus
      {Sphyr[ae]na}, sometimes used as food.

   Note: That of Europe and our Atlantic coast is {Sphyr[ae]na
         spet} (or {S. vulgaris}); a southern species is {S.
         picuda}; the Californian is {S. argentea}.

   2. (Zo["o]l.) A large edible fresh-water fish of Australia
      and New Zealand ({Thyrsites atun}).

Source : WordNet®

barracuda
     n : any voracious marine fish of the genus Sphyraena having an
         elongated cylindrical body and large mouth with
         projecting lower jaw and long strong teeth