Source : Webster's Revised Unabridged Dictionary (1913)

Whistler \Whis"tler\, n. [AS. hwistlere.]
   1. One who, or that which, whistles, or produces or a
      whistling sound.

   2. (Zo["o]l.)
      (a) The ring ousel.
      (b) The widgeon. [Prov. Eng.]
      (c) The golden-eye.
      (d) The golden plover and the gray plover.

   3. (Zo["o]l.) The hoary, or northern, marmot ({Arctomys
      pruinosus}).

   4. (Zo["o]l.) The whistlefish.