Hump·back n.
 1. A crooked back; a humped back.
 2. A humpbacked person; a hunchback.
 3. Zool. (a) 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. (b) A small salmon (Oncorhynchus gorbuscha), of the northwest coast of America; the humpbacked salmon.

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