Definition of hadrosaurus:

part of speech: noun

In geol., a huge herbivorous reptile, whose remains were discovered in 1858 in the chalk- marls of Haddenfield, New Jersey.

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A stick with one end heavier than the other; a thick heavy stick or cudgel for beating or defence; a principal war weapon in ancient times, and now in barbarous countries; a number of persons associated for some common purpose; the name of one of the suits of cards. ...