Archaeozoic

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Ar·chae·o·zo·ic

(är′kē-ə-zō′ĭk)

adj. & n.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Archaeozoic

(ˌɑːkɪəˈzəʊɪk) or

Archeozoic

adj

(Geological Science) a former word for Archaean

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Ar•che•o•zo•ic

(ˌɑr ki əˈzoʊ ɪk)
adj.

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]

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Noun	1.	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 Archaeozoic aeon, Archean, Archean aeon, Archean eon, Archeozoic, Archeozoic eon 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.	archaeozoic - of or belonging to earlier of two divisions of the Precambrian era; "archeozoic life forms" archeozoic 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"