LSJ
ῆρος, ὁ, = κωλυτής, τῶν ἀδικούντων Archyt. 3; θεοὶ… τῶν κακῶν κ. Porph. ap. Eus. PE 4.9; ἀριθμὸς κ. τῶν περαιτέρω ἐπιμορίων Iamb. in Nic. p. 52 P.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
[ῡ], ῆρος, ὁ, der Verhindernde, Iambl. u. a.Sp. S. κωλυτής.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)