'archaeozoic' definitions:

Of or belonging to earlier of two divisions of the Precambrian era; "archeozoic life forms" [syn: archeozoic, archaeozoic]

The time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life [syn: Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon]