Humpback /(?)/

Hump·back

Humpback

n.
  1. A crooked back; a humped back.
  2. A humpbacked person; a hunchback.
  3. Any whale of the genus Megaptera, characterized by a hump or bunch on the back. Several species are known. The most common ones in the North Atlantic are Megaptera longimana of Europe, and Megaptera osphyia of America; that of the California coasts is Megaptera versabilis. (Zool.)