humpback humpback /ˈhʌmpˌbæk/

noun

1. Large whalebone whale with long flippers noted for arching or humping its back as it dives  ( humpback , humpback whale , Megaptera novaeangliae )
   large whalebone whale with long flippers noted for arching or humping its back as it dives
   
   
2. A person whose back is hunched because of abnormal curvature of the upper spine  ( crookback , humpback , hunchback )
   a person whose back is hunched because of abnormal curvature of the upper spine
   
3. An abnormal backward curve to the vertebral column  ( humpback , hunchback , kyphosis )
   an abnormal backward curve to the vertebral column