Ecto- Definition
 ektō, ektə 
    affix
  
 Outside, external.
 Ectoderm.
 Webster's New World 
Origin of Ecto-
-  
Late Greek ekto- from ektos outside from ek, ek- out eghs in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 ModL < Gr ektos, outside < IE *eĝhs-, out > L ex
From Webster's New World College Dictionary, 5th Edition
From the Ancient Greek ἐκτός (ektos, “outside”).
From Wiktionary
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