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a combining form meaning “early,” “primeval,” used in the formation of compound words:
Eocene; eohippus.
Origin of eo-
< Greek, combining form of ēṓs (Attic héōs) dawn; akin to east, Aurora Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for eo-


combining form
early or primeval: Eocene, eohippus
Word Origin
from Greek, from ēōs dawn
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
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Word Origin and History for eo-

word-forming element used from mid-19c. (first in Eocene) in compound words formed by earth-scientists and meaning "characterized by the earliest appearance of," from Greek eos "dawn," from PIE *aus-, cognate with Modern English east (q.v.). Piltdown Man, before exposed as a fraud, was known as Eoanthropus.

Online Etymology Dictionary, © 2010 Douglas Harper
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