Jurassic definitions

jo͝o-răs'ĭk
Of, relating to, or being the period of geologic time from about 199 to 145 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.
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The Jurassic Period.
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Designating or of the second geologic period of the Mesozoic Era, characterized by the breakup of Laurasia and Gondwana and the development of giant dinosaurs and the first birds.
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The second and middle period of the Mesozoic Era, from about 208 to 144 million years ago. During this time the supercontinent Pangaea continued to split up and numerous shallow seas inundated the new continents. Dinosaurs were the dominant form of terrestrial animal life, and the earliest birds appeared. Marine life was dominated by ammonites and belemnites, and sponges, corals, bryozoa, and gastropods all flourished. Gymnosperms and cycads were the dominant land plants.
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(geology) Of or pertaining to the second period of the Mesozoic era, a time still dominated by dinosaurs.
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Of or pertaining to the people or region near the Jura Mountain Range of Europe.
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The period from 200 to 146 million years ago, after the Triassic and before the Cretaceous; the geologic formations of this period.
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Origin of jurassic

Named for the discovery and type location in the Jura Mountains of Switzerland.