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. 恐龙 - (disapproving)
a person or thing that is old-fashioned and cannot change in the changing conditions of modern life 守旧落伍的人；过时落后的东西
Word Originmid 19th cent.: from modern Latin dinosaurus, from Greek deinos ‘terrible’ + sauros ‘lizard’.