9 letters · 13 points in Scrabble
noun any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
originBack-formation from Hadrosauridae, from the type genus Hadrosaurus, which in turn was derived from Ancient Greek ἁδρός (hadrós, “strong”) + σαῦρος (saûros, “lizard”).
Etymology from Wiktionary, CC BY-SA 3.0