SIBILATION

sibilation, assibilation

(noun) pronunciation with a sibilant (hissing or whistling) sound

hiss, hissing, hushing, fizzle, sibilation

(noun) a fricative sound (especially as an expression of disapproval); “the performers could not be heard over the hissing of the audience”

Source: WordNet® 3.1

Etymology

Noun

sibilation (countable and uncountable, plural sibilations)

A hissing sound.

Source: Wiktionary

Sib`i*la"tion, n. Etym: [L. sibilatio.]

Definition: Utterance with a hissing sound; also, the sound itself; a hiss. He, with a long, low sibilation, stared. Tennyson.

Source: Webster’s Unabridged Dictionary 1913 Edition