Definition of dinosaur noun from the Oxford Advanced Learner's Dictionary

     

    dinosaur

     noun
    noun
    BrE BrE//ˈdaɪnəsɔː(r)//
     
    ; NAmE NAmE//ˈdaɪnəsɔːr//
     
     
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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 dinosaur, 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
  3. Word Origin mid 19th cent.: from modern Latin dinosaurus, from Greek deinos ‘terrible’ + sauros ‘lizard’.
See the Oxford Advanced American Dictionary entry: dinosaur