Source : Webster's Revised Unabridged Dictionary (1913)

Bull trout \Bull" trout`\ (Zo["o]l.)
   (a) In England, a large salmon trout of several species, as
       {Salmo trutta} and {S. Cambricus}, which ascend rivers;
       -- called also {sea trout}.
   (b) {Salvelinus malma} of California and Oregon; -- called
       also {Dolly Varden trout} and {red-spotted trout}.
   (c) The huso or salmon of the Danube.