[ ee-uh-zoh-ik ]

  1. (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

Words Nearby Eozoic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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.

British Dictionary definitions for Eozoic


/ (ˌiːəʊˈzəʊɪk) /

  1. 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