hadrosaurid

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had·ro·saur·id

 (hăd′rə-sôr′ĭd)
n.
Any of various herbivorous ornithischian dinosaurs of the family Hadrosauridae of the Cretaceous Period, having a broad toothless beak, numerous teeth in the back of the jaw, a stiff tail, and sometimes a crest on the head. Also called duckbill, duck-billed dinosaur, hadrosaur.

[From New Latin Hadrosauridae, family name, from Hadrosaurus, type genus; see hadrosaurus.]

had′ro·saur′id adj.