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

 

Cretaceous

 adjective
adjective
BrE BrE//krɪˈteɪʃəs//
 
; NAmE NAmE//krɪˈteɪʃəs//
 
(geology)
 
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of the period between around 146 and 65 million years ago, when dinosaurs lived (until they died out); of the rocks formed during this time
See the Oxford Advanced American Dictionary entry: Cretaceous

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