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v. οἰκτείρω.
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LSJ
(in codd. freq. -ειρ, but -ιρ- in early Inscrr., IG1². 971, 976, 982, v. sub fin. ; cf. κατοικτίρω); impf. ᾤκτ(ε)ιρον Stesich. 18 ; fut. οἰκτιρῶ A. Fr. 199.6 (-ερεῖ codd.); aor. ᾤκτ(ε)ιρα Il. 11.814, A. Pr. 354, al. ; Ion. οἴκτ(ε)ιρα Hdt. 3.52; — Pass., only pres. and impf., ibid., X. Oec. 7.40, S. El. 1412 ; — later forms (as if from οἰκτειρέω) ; fut. οἰκτειρήσω Sch. Od. 4.740, LXX Ex. 33.19, Ep. Rom. 9.15, Lib. Descr. 30.18 ; aor. ᾠκτείρησα Sch. A. Pr. 353 ; aor. Pass. οἰκτειρηθῆναι ib. 637. — Cf. οἰκτείρημα : — pity, have pity upon, c. acc. pers., Il. 11.814, 16.5, Hdt. l.c., 7.38 ; ἐλεῆσαι καὶ οἰ. Pl. Euthd. 288d ; οἰ. τινά τινος pity one for or because of a thing, οἰκτίρω σε θεσφάτου μόρου A. Ag. 1321, cf. Supp. 209 ; also οἰ. τινά τινος ἕνεκα X. Oec. 2.7 ; ἐπί τινι ib. 4 ; c. acc. rei, E. Med. 1233, Ar. V. 328, Antipho 3.1.2. c. inf., οἰ. νιν λιπεῖν I am sorry to leave her, S. Aj. 652 ; οἰ. εἰ… to be sorry that it should be, X. An. 1.4.7. [Aeol. οἰκτίρρω Hdn. Gr. 2.558 ; hence οἰκτῑρω is prob. from *οἰκτιρ-yω, and οἰκτίρετε [ῐ] in AP 7.267 (Posidipp.) is an error ; but the Att. fut. is οἰκτερῶ acc. to Hdn. Gr. 2.559.]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)