"cretaceous" in the noun sense
1. Cretaceous, Cretaceous period
from 135 million to 63 million years ago end of the age of reptiles appearance of modern insects and flowering plants
"cretaceous" in the adjective sense
1. cretaceous
abounding in chalk
2. Cretaceous
of or relating to or denoting the third period of the Mesozoic era
Source: WordNet® (An amazing lexical database of English)
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