LSJ
ονος, ὁ, the good Genius, less correct for ἀγαθὸς δαίμων, A.D. Adv. 60.15, PMagLeid. W. 17.25.
an Egyptian serpent, Hist. Aug. Elag. 28, Philum. Ven. 29.
Astrol., propitious region (east of μεσουράνημα), Vett.Val. 135.32.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ονος, ὁ, nach Apollon. pron. p. 26 der nom. zu ἀγαθοῦ δαίμονος, s. δαίμων.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)