Cretaceous period

Từ điển WordNet v3.1 - WordNet Dictionary

noun

from 135 million to 63 million years ago;
end of the age of reptiles;
appearance of modern insects and flowering plants
• Syn:
Cretaceous
• Derivationally related forms:
Cretaceous (for: Cretaceous)
• Instance Hypernyms:
period, geological period
• Part Holonyms:
Mesozoic, Mesozoic era, Age of Reptiles