Source : Webster's Revised Unabridged Dictionary (1913)

Sawfish \Saw"fish`\, n. (Zo["o]l.)
   Any one of several species of elasmobranch fishes of the
   genus {Pristis}. They have a sharklike form, but are more
   nearly allied to the rays. The flattened and much elongated
   snout has a row of stout toothlike structures inserted along
   each edge, forming a sawlike organ with which it mutilates or
   kills its prey.

Source : WordNet®

sawfish
     n : primitive ray with sharp teeth on each edge of a long
         flattened snout
     [also: {sawfishes} (pl)]