(in ancient Greece and Rome) any of a number of women believed to be oracles or prophetesses, one of the most famous being the sibyl of Cumae, who guided Aeneas through the underworld
2.
a witch, fortune-teller, or sorceress
[C13: ultimately from Greek Sibulla, of obscure origin]
c.1300, from O.Fr. sibile, from L. Sibylla, from Gk. Sibylla, name for any of several prophetesses consulted by ancient Greeks and Romans, of uncertain origin. Said to be from Doric Siobolla, from Attic Theoboule "divine wish."