/ Dictionary / Index S sibilant: Meaning and Definition of Find definitions for: sib•i•lant Pronunciation: (sib'u-lunt), [key] — adj. hissing. characterized by a hissing sound; noting sounds like those spelled with s in thisrosepressurepleasureand certain similar uses of ch, sh, z, zh, etc. —n. a sibilant consonant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sibilant (Thesaurus) siberite sibilate 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