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
Origin of JurassicFrench jurassique, after Jura Mountains
the Jurassic Period or its rocks
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. See Table at geologic time.
The Jurassic Period.
Origin of JurassicFrench jurassique, after the Jura (Mountains).
Named for the discovery and type location in the Jura Mountains of Switzerland.