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

 

the Jurassic

 noun
noun
BrE BrE//ðə ˌdʒʊˈræsɪk//
 
; NAmE NAmE//ðə ˌdʒʊˈræsɪk//
 
[singular](geology)
 
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the period (3) between around 208 to 146 million years ago, when the largest known dinosaurs lived