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WordReference Random House Unabridged Dictionary of American English © 2024Ar•che•o•zo•ic (är′kē ə zō′ik),USA pronunciation [Geol.]adj. - Geologynoting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered. See table under geologic time.
n. - Geologythe Archeozoic division of geologic time or the rock systems formed then.
Also, Archaeozoic. - archeo- + Greek zō(é̄) life + -ic 1870–75
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