LSJ
οῦ, ὁ, one who strengthens, Sch. Oppian. H. 4.421. title of a grade in the mysteries of Mithras, Röm.Mitt. 49.206 (Dura).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ὁ, der Dicht- od. Festmachende, Schol. Opp. Hal. 4.121.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)