humpback

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about humpback at Wordnik → Where our words come from →

1. An abnormal backward curve to the vertebral column.
2. A person whose back is hunched because of abnormal curvature of the upper spine.
3. Large whalebone whale with long flippers noted for arching or humping its back as it dives.