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ἐξ

Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται -> For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
Corpus Hippocraticum, Aphorisms 1.6.2

German (Pape)

[Seite 861] praepos., statt ἐκ (w. m. s.), vor Vokalen.

Greek (Liddell-Scott)

ἐξ: Λατ. ex, ὁ πλήρης τύπος τῆς προθ. ἐκ, διαμείνας πρὸ φωνήεντος εἴτε ἐν συντάξει εἴτε ἐν συνθέσει, ὡσαύτως καὶ πρό τινων συμφώνων· οἷον. ἐξ σέθεν Συλλ. Ἐπιγρ. 2292· ἐξ Σμύρνης 3137. 11, 81· ἐξ Ρηνείας 158. 26· ὡσαύτως ἐν τέλει στίχου μετὰ τὴν ἰδίαν πτῶσιν, κακῶν ἐξ Ἰλ. Ξ. 472, πρβλ. Θεόκρ. 22. 30.

French (Bailly abrégé)

v. ἐκ.

Spanish (DGE)

v. ἐκ.

Greek Monotonic

ἐξ: Λατ. ex, τύπος της πρόθ. ἐκ, πριν από φωνήεν και πριν από ορισμένα σύμφωνα, όπως τα , σ.

Russian (Dvoretsky)

ἐξ: перед гласным = ἐκ.

Etymological

Grammatical information: adverb (preverb) and preposition
Meaning: out (Il.). Details in Schwyzer-Debrunner 461ff.
Other forms: before consonant ἐκ (ἐγ, ἐχ), dial. ἐς, Boeot. always ἐ(σ)ς
Derivatives: ἔξω etc., s. v. ἐξεῖ ἔξω H wth loc. ending, Cret. ἐξοι, εξος Delphi; on ἔξουθα, ἔξεσα Lejeune, Adverbes en -θεν 329, 355. ἐχθός from ἐξ (Locr., Delphi) with ἔχθοι, ἔχθω, ἐχθοδαπός stranger (Pergmon IIp).
Origin: IE [Indo-European] [292} *h₁eǵhs out; or *h₁eḱs
Etymology: Exact agreements ἐξ in Italic and Celtic, e. g. Lat. ex (ē, ec-), Welsh ex-, OIr. ess-; then in Baltic and Slavic forms with unclear i-, e. g. Lith. ìš, ìž, OCS is, iz; doubtful Arm. i, y- out, from (beside i, y- in). - Because of ἔσχατος, ἐχθός (= ἐκτός) a. o. one posits after Wackernagel KZ 33, 38ff. (= Kl. Schr. 1, 717ff.) as IE form not *eḱs, but *eǵhs (*eǵzh); an assumption, which is unnecessary for ἐκτός (s. v.), but for ἔσχατος seems unavoidable (s. s. v.)

Middle Liddell

prep
Lat. ex, the form of the prep. ἐκ, before a vowel and before some consonants, as ῥ ς.