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had·ro·sau·rid | \ ˌha-drə-ˈsȯr-əd 
\
\ plural hadrosaurids
Definition of hadrosaurid
: hadrosaur, duck-billed dinosaur Like ceratopsians, they too had closely packed chewing teeth, but by the time hadrosaurids evolved, the dentition consisted of relatively small teeth that were organized into a complex battery, all the better for grinding up vegetation.— David B. Weishampel, Natural History, June 1995
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Time Traveler for hadrosaurid
The first known use of hadrosaurid was circa 1893
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