Definition of dinosaur noun from the Oxford Advanced American Dictionary

     

    dinosaur

     noun
    noun
    NAmE//ˈdaɪnəˌsɔr//
     
     
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  1. 1 an animal that lived millions of years ago but is now extinct (= it no longer exists). There were many types of dinosaurs, some of which were very large.
  2. 2(disapproving) a person or thing that is old-fashioned and cannot change in the changing conditions of modern life
See the Oxford Advanced Learner's Dictionary entry: dinosaur