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Variant of Archean.
(Biology) any member of the Archaea, a domain of prokaryotic microorganisms, distinguished from bacteria on molecular phylogenetic grounds and often found in hostile environments, such as volcanic vents and hot springs
(Geological Science) of or relating to the highly metamorphosed rocks formed in the early Precambrian era
(Geological Science) the earlier of two divisions of the Precambrian era, during which the earliest forms of life are assumed to have appeared
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|Adj.||1.||archaean - of or relating to the earliest known rocks formed during the Precambrian Eon|
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"