Noah Webster's Dictionary (a.) Pertaining to the sibyls; uttered, written, or composed by sibyls; like the productions of sibyls. Int. Standard Bible Encyclopedia SIBYLLINE ORACLES sib'-i-lin, -lin or'-a-k'-lz. See APOCALYPTIC LITERATURE, sec. B, V. ORACLES, SIBYLLINE sib'-i-lin, -lin. See APOCALYPTIC LITERATURE, sec. V.