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Of, relating to, or being the period of geologic time from about 200 to 146 million years ago, the second period of the Mesozoic Era, in which dinosaurs were the dominant form of terrestrial animal life, and the earliest birds appeared. See Table at geologic time.
The Jurassic Period.
[French jurassique, after the Jura (Mountains).]
(Geological Science) of, denoting, or formed in the second period of the Mesozoic era, between the Triassic and Cretaceous periods, lasting for 55 million years during which dinosaurs and ammonites flourished
(Geological Science) the Jurassic the Jurassic period or rock system
[C19: from French jurassique, after the Jura (Mountains)]
1. of or pertaining to a geologic period of the Mesozoic Era, from 190 million to 140 million years ago, characterized by the presence of dinosaurs and the advent of birds and mammals.n.
2. the Jurassic Period or System.
[1825–35; Jur (a) + -assic; compare French jurassique]
The second and middle period of the Mesozoic Era, from about 208 to 144 million years ago, during which dinosaurs were the dominant form of land life and the earliest birds appeared. See Chart at geologic time.