(formerly) noting or pertaining to the Precambrian Era, especially the period including the beginnings of animal life.
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How to use Eozoic in a sentence
The English chalk and the chalky modern mud of the Atlantic sea-bed, are precisely similar in origin to the Eozoic limestones.
In it the forms of animal and plant life that had been becoming more numerous and varied from the Eozoic onward, culminated.
In his system the greater divisions of the history were “Times:” thus the Eozoic was a time and the Palozoic was a time.
Another problem is that of means of subsistence for the Eozoic Foraminifera.
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
British Dictionary definitions for Eozoic
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