sibilation
1. [ noun ] a fricative sound (especially as an expression of disapproval)
Synonyms: hissing hiss
Examples:

"the performers could not be heard over the hissing of the audience"

Related terms: noise hiss boo hiss
2. [ noun ] pronunciation with a sibilant (hissing or whistling) sound
Synonyms: assibilation
Related terms: pronunciation assibilate sibilate hiss
Similar spelling:   sibilate
  spoilation