the GNU version of the Collaborative International Dictionary of English
n. Utterance with a hissing sound; also, the sound itself; a hiss.
The Century Dictionary and Cyclopedia
n. The act of sibilating or hissing; the utterance or emission of sibilant sounds; also, a hissing sound; in style, predominance or prominence of the sound of s.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. pronunciation with a sibilant (hissing or whistling) sound
n. a fricative sound (especially as an expression of disapproval)
Word Usage
"Again Poole's lips moved, and now his voice was just audible as a faint sibilation, producing no intelligible sounds."