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Jurassic

Pronunciation: /dʒʊˈrasɪk/

Definition of Jurassic

adjective

Geology

relating to or denoting the second period of the Mesozoic era, between the Triassic and Cretaceous periods.
(as noun the Jurassic) the Jurassic period or the system of rocks deposited during it.

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