Definition of Jurassic adjective from the Oxford Advanced Learner's Dictionary

 

Jurassic

 adjective
adjective
BrE BrE//dʒʊˈræsɪk//
 
; NAmE NAmE//dʒʊˈræsɪk//
 
(geology)
 
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of the period between around 208 to 146 million years ago, when the largest known dinosaurs lived; of the rocks formed during this time Word Origin mid 19th cent.: from French jurassique; named after the Jura Mountains, in France and Switzerland.
See the Oxford Advanced American Dictionary entry: Jurassic

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