D defs.my
Entry 1 sense Webster, 1913

Whaleback

· Whale·back · IPA
01 n. A form of vessel, often with steam power, having sharp ends and a very convex upper deck, much used on the Great Lakes, esp. for carrying grain.
  1. 1.
    A form of vessel, often with steam power, having sharp ends and a very convex upper deck, much used on the Great Lakes, esp. for carrying grain.(Naut.)