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
noun
2. the Jurassic
Word origin
C19: from French jurassique, after the Jura (Mountains)
Jurassic in American English
(dʒuˈræsɪk; dʒʊˈræsɪk)
adjective
[sometimesj-]
designating or of the second geologic period of the Mesozoic Era, characterized by the breakupof Laurasia and Gondwana and the development of giant dinosaurs and the first birds