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eo-

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  1. a combining form meaning “early,” “primeval,” used in the formation of compound words: Eocene; eohippus.
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Origin of eo-

< Greek, combining form of ēṓs (Attic héōs) dawn; akin to east, Aurora
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eo-

eo-

combining form
  1. early or primevalEocene; eohippus
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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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper