sibilation

Noun	1.	sibilation - a fricative sound (especially as an expression of disapproval); "the performers could not be heard over the hissing of the audience" hiss, hissing noise - sound of any kind (especially unintelligible or dissonant sound); "he enjoyed the street noises"; "they heard indistinct noises of people talking"; "during the firework display that ended the gala the noise reached 98 decibels"
	2.	sibilation - pronunciation with a sibilant (hissing or whistling) sound assibilation pronunciation - the manner in which someone utters a word; "they are always correcting my pronunciation"

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