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eo-

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eo-

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

Origin:
< Gk, comb. form of ēs (Attic héōs) dawn; akin to east, Aurora
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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eo-  
pref.  Most primitive; earliest: eohippus.

[From Greek ēōs, dawn; see aus- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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