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ARCHEOZOIC

Definition:

[noun] the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Synonyms: Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
[adjective] formed in the earlier of two divisions of the Precambrian era; "archeozoic life forms"
Synonyms: archaeozoic