LSJ
ἡ, Sibyl, Heraclit. 92, Ar. Pax 1095, 1116, Pl. Phdr. 244b. Early writers only recognize one Sibyl (Σίβυλλαι καὶ Βάκιδες, Arist. Pr. 954a36, is no exception), first localized at Erythrae or Cumae, Id. Mir. 838a6; later, others are mentioned, cf. Str. 14.1.34, Paus. 10.12.1 sqq., Sch. Pl. l.c., Buresch Klaros p. 120. [Σίβιλλα IG2². 1534.85 (iv BC).]
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ἡ, die Sibylle, s. nom. propr.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)