iˈsoʊ.ɪk

Definitions

1. noun

relating to or characteristic of the earliest geologic time scale, from about 4.5 to 2.5 billion years ago

“The eozoic era of Earth’s history is still not fully understood by scientists.”

2. adjective

of or relating to the earliest geologic time scale, from about 4.5 to 2.5 billion years ago

“The eozoic rocks found in the area date back millions of years.”