Definition of humpback

• n. - A crooked back; a humped back.
• n. - A humpbacked person; a hunchback.
• n. - 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 M. osphyia of America; that of the California coasts is M. versabilis.
• n. - A small salmon (Oncorhynchus gorbuscha), of the northwest coast of America.