eo-

eo-

(word root) dawn, early

Examples of words with the root eo-: Eocene

Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

eo-

pref.

Most primitive; earliest: eoraptor.

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[From Greek ēōs, dawn; see aus- in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

eo-

combining form

early or primeval: Eocene; eohippus.

[from Greek, from ēōs dawn]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

EO

executive order.

eo-

a combining form meaning “early,” “primeval”: Eocene; eohippus.

[< Greek, comb. form of ēṓs (Attic héōs) dawn; akin to east, Aurora]

e.o.

ex officio.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.