"humpbacks" in the noun sense
1. kyphosis, humpback, hunchback
an abnormal backward curve to the vertebral column
2. humpback, hunchback, crookback
a person whose back is hunched because of abnormal curvature of the upper spine
3. humpback, humpback whale, Megaptera novaeangliae
large whalebone whale with long flippers noted for arching or humping its back as it dives
Source: WordNet® (An amazing lexical database of English)
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