Definition of Jurassic adjective from the Oxford Advanced American Dictionary

 

Jurassic

 adjective
adjective
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
the Jurassic
 
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noun [singular]
See the Oxford Advanced Learner's Dictionary entry: Jurassic