LSJ
= ἱλήκω, only in imper. ἵληθι, in prayers, be gracious! Od. 3.380, 16.184, h.Hom. 20.8, etc. ; Aeol. ἔλλαθι; Dor. ἵλαθι Theoc. 15.143, Luc. Epigr. 22; both together, ἵλαθ΄, ἄναξ, ἵληθι AP 12.158 (Mel.); pl., ἵλατε A.R. 4.984, Man. 6.754. (Prob. pf. imper. fr. se-sl-; Aeol. ἔλλ- points to εἵλ- as the true Ion. spelling; Dor. pf. part. dat. ἱλαότι (leg. εἱλ-) Hsch. ; ι is genuine in ἵλεως, ἱλάσκομαι [fr. si-sl-].)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)