dinosaur - definition and synonyms

 
noun [countable] 

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/ˈdaɪnəˌsɔː(r)/
singulardinosaur
pluraldinosaurs
  1. 1
    a large frightening animal that lived a very long time ago but is now extinct (=all of them died)
  2. 2
    informal someone or something that is very old-fashioned and no longer useful or effective