/ Dictionary / Index S sibilate: Meaning and Definition of Find definitions for: sib•i•late Pronunciation: (sib'u-lāt"), [key] — v., -lat•ed, -lat•ing. —v.i. to hiss. —v.t. to utter or pronounce with a hissing sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sibilate (Thesaurus) sibilant Sibir&hamza; Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language