dinosaur
/ˈdaɪnəsɔː(r)/noun
1
- a fossil reptile of the Mesozoic era, often reaching an enormous size恐龙。
- The dinosaurs are placed, according to their hip structure, in two distantly related orders （see ORNITHISCHIAN and SAURISCHIAN）. Some of them may have been warm-blooded, and their closest living relatives are the birds. Dinosaurs were all extinct by the end of the Cretaceous period (65 million years ago), the most popular theory being that the extinctions were the result of the impact of a large meteorite.
2
- a person or thing that is outdated or has become obsolete because of failure to adapt to changing circumstances因不适应变化的环境而过时的人（或物）。
派生词
dinosaurian
adjective & noun词源
mid 19th cent.: from modern Latin dinosaurus, from Greek deinos 'terrible' + sauros 'lizard'.