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also Ar·chae·o·zo·ic  (är′kē-ə-zō′ĭk)

Ar′che·o·zo′ic adj.


(Geological Science) a variant spelling (esp US) of Archaeozoic


(ˌɑr ki əˈzoʊ ɪk)
1. of or pertaining to the earlier half of the Precambrian Era, before 2.5 billion years ago, when the only life forms were blue-green algae and bacteria.
2. the Archeozoic division of geologic time or the rock systems formed then.
[1870–75; archeo- + -zoic]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Archeozoic - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Precambrian, Precambrian aeon, Precambrian eon, Precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Adj.1.archeozoic - of or belonging to earlier of two divisions of the Precambrian era; "archeozoic life forms"
geology - a science that deals with the history of the earth as recorded in rocks
early - at or near the beginning of a period of time or course of events or before the usual or expected time; "early morning"; "an early warning"; "early diagnosis"; "an early death"; "took early retirement"; "an early spring"; "early varieties of peas and tomatoes mature before most standard varieties"