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The Collaborative International Dictionary
archaeozoic

archaeozoic \archaeozoic\, Archaeozoic \Ar`ch[ae]*o*zo"ic\, a. [Gr. 'archai^os ancient + zw^,on animal.] (Zo["o]l.) Like or belonging to the earliest forms of animal life.

2. (Geol.) formed in or belonging to the earlier of two divisions of the Precambrian era. archaeozoic life forms

Syn: archeozoic

WordNet
archaeozoic

adj. formed in the earlier of two divisions of the Precambrian era; "archeozoic life forms" [syn: archeozoic]

Usage examples of "archaeozoic".

I suspected, that earth has seen whole cycle or cycles of organic life before known one that begins with Archaeozoic cells.

And the world, by implication, though having reached from the Archaeozoic to the Present, and from cave dwellings to skyscrapers with roof-gardens, is just as far removed from true Paradise on earth.