cretaceous
adjectiveUK /krɪˈteɪʃəs/
US /krɪˈteɪʃəs/
Made of or full of chalk.
The cretaceous cliffs crumbled into the sea.
OTHER MEANINGS
2. Relating to the Cretaceous period, the last part of the age of dinosaurs.
Tyrannosaurus rex lived during the Cretaceous period.
3. White or pale like chalk.
A cretaceous dust covered the old blackboard.
4. A geological period about 145 to 66 million years ago.
Many new kinds of flowers appeared in the Cretaceous.