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 of Eozoic

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for eozoic

Historical Examples of eozoic

Another problem is that of means of subsistence for the Eozoic Foraminifera.
The Story of the Earth and Man
J. W. Dawson
Such a great movement unquestionably closed the Eozoic period of geology.
The Origin of the World According to Revelation and Science
John William 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

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