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WordReference Random House Unabridged Dictionary of American English © 2024had•ro•saur (had′rə sôr′),USA pronunciation n. - Paleontologya bipedal dinosaur of the genus Hadrosaurus, belonging to the ornithopod family Hadrosauridae of the late Cretaceous Period, having broad, flat jaws for scooping up water plants.
Also called duck-billed dinosaur. - Neo-Latin Hadrosaurus (1858) genus name, equivalent. to Greek hadr(ós) thick, bulky + -o- -o- + saûros -saur
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