Source : Webster's Revised Unabridged Dictionary (1913)

Sawbill \Saw"bill`\, n.
   The merganser. [Prov. Eng.]

Source : WordNet®

sawbill
     n : large crested fish-eating diving duck having a slender
         hooked bill with serrated edges [syn: {merganser}, {fish
         duck}, {sheldrake}]