Eozoic

[ ee-uh-zoh-ik ]

/ ˌi əˈzoʊ ɪk /

adjective Geology.

(formerly) noting or pertaining to the Precambrian Era, especially the period including the beginnings of animal life.

Origin of Eozoic

First recorded in 1875–80; eo- + zo- + -ic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for eozoic

In his system the greater divisions of the history were “Times:” thus the Eozoic was a time and the Palozoic was a time.
The Story of the Earth and Man|J. W. Dawson
Another problem is that of means of subsistence for the Eozoic Foraminifera.
The Story of the Earth and Man|J. W. Dawson
In the oldest rocks known to geologists—those of the Eozoic time—some indications of the presence of life are found.
Facts and fancies in modern science|John William Dawson
The English chalk and the chalky modern mud of the Atlantic sea-bed, are precisely similar in origin to the Eozoic limestones.
The Story of the Earth and Man|J. W. Dawson

In it the forms of animal and plant life that had been becoming more numerous and varied from the Eozoic onward, culminated.
The Story of the Earth and Man|J. W. Dawson

British Dictionary definitions for eozoic

Eozoic

/ (ˌiːəʊˈzəʊɪk) /

adjective

archaic of or formed in the part of the Precambrian era, during which life first appeared

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012