Eozoic

Eozoic

[ee-uh-zoh-ik]
adjective Geology.
(formerly) noting or pertaining to the Precambrian Era, especially the period including the beginnings of animal life.

Origin:
1875–80; eo- + zo- + -ic

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Eozoic (ˌiːəʊˈzəʊɪk)
 
adj
archaic of or formed in the part of the Precambrian era, during which life first appeared

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