• synonyms


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

  • 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.

  • In the oldest rocks known to geologists—those of the Eozoic time—some indications of the presence of life are found.

  • 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.

British Dictionary definitions for eozoic


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