Source : Webster's Revised Unabridged Dictionary (1913)

Growler \Growl"er\, n.
   1. One who growls.

   2. (Zo["o]l.) The large-mouthed black bass. [Local]

   3. A four-wheeled cab. [Slang, Eng.]

Source : WordNet®

growler
     n 1: a speaker whose voice sounds like a growl
     2: a small iceberg or ice floe just large enough to be
        hazardous for shipping