(Zool.) (a) Any one of several species of true trouts which descend rivers and enter the sea after spawning, as the European bull trout and salmon trout, and the eastern American spotted trout. (b) The common squeteague, and the spotted squeteague. (c) A California fish of the family Chiridae, especially Hexagrammus decagrammus; -- called also spotted rock trout. See Rock trout, under Rock. (d) A California sciaenoid fish (Cynoscion nobilis); -- called also white sea bass. [ 1913 Webster ]