Definitions

1. adjective

relating to or characteristic of the Cretaceous period, a geologic time period from about 145 to 66 million years ago.

“The cretaceous landscape was home to a variety of ancient plants and animals.”

2. noun

a member of the Cretaceous period, a geologic time period from about 145 to 66 million years ago.

“Fossils found in the cretaceous layer indicate a diverse ecosystem.”