noun a crooked back; a humped back.
2. humpback ·noun a humpbacked person; a hunchback.
3. humpback ·noun a small salmon (oncorhynchus gorbuscha), of the northwest coast of america.
4. humpback ·noun 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.