Definition
(noun) a hissing sound such as the ’s’ or ’sh’ in ’sash’ or ’surge’. (adjective) characterized by a hissing sound such as the ’s’ or ’sh’ in ’sash’ or ’surge’.
DFW's Sentence Pendent in front of John Ziegler's face, attached to the same type of hinged, flexible stand as certain student desk lamps, is a Shure-brand broadcast microphone that is sheathed in a gray foam filtration sock to soften popped p's and hissed sibilants.
My Sentence Marty had an annoying tendency to overextend on certain words and the resulting sibilants, music to no one's ears, provided one of the reasons his co-workers avoided asking him questions, or as Thomas once said, "You know, I've never given it much thought, but a s is an awfully hard letter to avoid."
01: DFW Source: The Host
02: Definition Source: Wiktionary and Ninjawords