Ssspeak like thisss

WordNet Word definitions in WordNet
v. pronounce with an initial sibilant utter a sibilant express or utter with a hiss [syn: hiss , sizz , siss ] make a sharp hissing sound, as if to show disapproval [syn: hiss , siss , sizz ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sibilate \Sib"i*late\, v. t. & i. To pronounce with a hissing sound, like that of the letter s; to mark with a character indicating such pronunciation.

Wiktionary Word definitions in Wiktionary
vb. 1 To hiss 2 To speak with a hissing sound

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1650s, from Latin sibilatus , past participle of sibilare "to hiss, whistle" (see sibilant (adj.)). Related: Sibilated ; sibilating .