- kyphosis, humpback, hunchback - an abnormal backward curve to the vertebral column
--1 is a kind of spinal curvature
- humpback, hunchback, crookback - a person whose back is hunched because of abnormal curvature of the upper spine
--2 is a kind of cripple
- humpback, humpback whale, Megaptera novaeangliae - large whalebone whale with long flippers noted for arching or humping its back as it dives
--3 is a kind of baleen whale, whalebone whale
--3 is a member of Megaptera, genus Megaptera