From Wiktionary, the free dictionary
εξ • (ex)
- Alternative form of εκ (ek) (used before a vowel)
εκ δεξιών και εξ ευωνύμων- ek dexión kai ex evonýmon
- on the one hand and on the other
- (literally, “on the right-hand and on the left-hand”)
- εξ- (ex-) (combining form)