Bailly
v. ἔξω.
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LSJ
Adv., Comp. of ἔξω, more outside, δρόμου ἐ. A. Ch. 1023, cf. Arist. Metaph. 1055a25, LXX Jb. 18.17, etc. ; — hence later, Adj. ἐξώτερος, outer, LXX Ex. 26.4, etc., Ev. Matt. 8.12; ξυστός POxy. 896.14 (iv AD).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
more outside , with genitive, (Aeschulus Tragicus) (ML)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars