sibylline /ˈsɪbɪlaɪn/adjective 4noun 1forms 1 adjective4 •Of or pertaining to or resembling a sibyl or female oracle, especially the Cumaean Sibyl and the Sibylline Books.Another early form of rhapsodomancy is represented by the sibylline books. — 1998 •Having oracle-like predicting powers, clairvoyant. •Occult, mysterious. •Excessively and exorbitantly expensive. (In allusion to the Sibyl who sold three books to Tarquinius Superbus at the price of the original nine.) noun1 •One of the Sibylline Oracles or Sibylline Books. formssibyllines
