/ ˈdaɪnəsɔː(r); NAmE / noun
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.
( disapproving ) a person or thing that is old-fashioned and cannot change in the changing conditions of modern life
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WORD ORIGIN
mid 19th cent.: from modern Latin dinosaurus , from Greek deinos terrible + sauros lizard.