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Noun
- 1. Cretaceous, Cretaceous period
- usage: from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
Adjective
- 1. cretaceous
- usage: abounding in chalk
- 2. Cretaceous
- usage: of or relating to or denoting the third period of the Mesozoic era
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Definition and meaning of cretaceous (Dictionary)