LSJ
οἱ, those who practised medicine in conjunction with astrology, esp. in Egypt, Ptol. Tetr. 16, Heph.Astr. Praef., Cat.Cod.Astr. 1.126.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
[ιᾱ], οἱ, Aerzte, die zugleich Astrologen waren, Procl.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)