eo-

eo-

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

Origin:
< Greek, combining form of ēṓs (Attic héōs) dawn; akin to east, Aurora

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eo-
 
combining form
early or primeval: Eocene; eohippus
 
[from Greek, from ēōs dawn]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

eo-
prefix used from mid-19c. in compound words formed by earth-scientists and meaning characterized by the earliest appearance of, from Gk. eos dawn, from PIE *ausus, cognate with Mod.Eng. east (q.v.). Piltdown Man, before exposed as a fraud, was known as Eoanthropus.
Online Etymology Dictionary, © 2010 Douglas Harper
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