Source : Webster's Revised Unabridged Dictionary (1913)

Whaler \Whal"er\, n.
   A vessel or person employed in the whale fishery.

Whaler \Whal"er\, n.
   One who whales, or beats; a big, strong fellow; hence,
   anything of great or unusual size. [Colloq. U. S.]

Source : WordNet®

whaler
     n 1: a seaman who works on a ship that hunts whales
     2: a ship engaged in whale fishing [syn: {whaling ship}]