/ Dictionary / Index S sibylline: Meaning and Definition of Find definitions for: sib•yl•line Pronunciation: (sib'u-lēn", -līn", -lin), [key] — adj. of, resembling, or characteristic of a sibyl; prophetic; oracular. mysterious; cryptic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sibylline (Thesaurus) Sibylla sic Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language