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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Had·ro·sau·rus n.  Paleon. An American herbivorous dinosaur of great size, allied to the iguanodon.  It is found in the Cretaceous formation.
 

From: WordNet (r) 2.0

 hadrosaurus
      n : any of numerous large bipedal ornithischian dinosaurs having
          a horny duck-like bill and webbed feet; may have been
          partly aquatic [syn: hadrosaur, duck-billed dinosaur]