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1. Of, relating to, or being the period of geologic time from about 146 to 66 million years ago, the third and most recent period of the Mesozoic Era. The Cretaceous Period is characterized by the formation of modern continents from the supercontinent Pangaea and by the development of flowering plants. The Period ended with the sudden extinction of the dinosaurs and many other forms of life. See Table at geologic time.
2. cretaceous Of, containing, or resembling chalk.
The Cretaceous Period.
[From Latin crētāceus, chalky, from crēta, chalk, from Crēta (terra), Cretan (earth).]
(Chemistry) consisting of or resembling chalk
[C17: from Latin crētāceus, from crēta, literally: Cretan earth, that is, chalk]
(Geological Science) of, denoting, or formed in the last period of the Mesozoic era, between the Jurassic and Tertiary periods, lasting 80 million years during which chalk deposits were formed and flowering plants first appeared
(Geological Science) the Cretaceous the Cretaceous period or rock system
1. resembling or containing chalk.
2. (cap.) noting or pertaining to a period of the Mesozoic Era, from 140 million to 65 million years ago, characterized by the greatest development and subsequent extinction of dinosaurs and the advent of flowering plants and modern insects.n.
3. (cap.) the Cretaceous Period or System.
The third and last period of the Mesozoic Era, from about 144 to 65 million years ago, characterized by the development of flowering plants. The Cretaceous Period ended with the sudden mass extinction of dinosaurs and many other forms of life. See Chart at geologic time.
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|Noun||1.||Cretaceous - from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants|
|Adj.||1.||cretaceous - abounding in chalk|
|2.||Cretaceous - of or relating to or denoting the third period of the Mesozoic era|