Jurassic
/dʒʊˈræsɪk/adjective
1- Geology of, relating to, or denoting the second period of the Mesozoic era, between the Triassic and Cretaceous periods【地质】（与）（中生代第二阶段, 三叠纪和白垩纪之间的）侏罗纪（有关）的。
1.1
- as noun the Jurassic the Jurassic period or the system of rocks deposited during it侏罗纪时期; 侏罗纪时期沉积的岩石层。
The Jurassic lasted from about 208 to 146 million years ago. Large reptiles, including the largest known dinosaurs, were dominant on both land and sea. Ammonites were abundant, and the first birds (including Archaeopteryx) appeared.
词源
mid 19th cent.: from French jurassique; named after the Jura Mountains （see JURA1）.