Source : Webster's Revised Unabridged Dictionary (1913)

Bowhead \Bow"head`\, n. (Zo["o]l.)
   The great Arctic or Greenland whale. ({Bal[ae]na
   mysticetus}). See {Baleen}, and {Whale}.

Source : WordNet®

bowhead
     n : large-mouthed arctic whale [syn: {bowhead whale}, {Greenland
         whale}, {Balaena mysticetus}]