A hunchback is someone who has a large lump on their back because their spine is curved. an offensive word for someone who has a large raised part on their back because their spine curves in an unusual way
a novel by Victor Hugo about a kind but ugly hunchback (=someone whose back has a large raised part on it) called Quasimodo, who rings bells in the cathedral of Notre Dame in Paris in the 15th century. He secretly loves a beautiful woman called Esmeralda, and when she is wrongly punished for being a murderer, he tries to save her (1831)