a hissing sound such as the 's' or 'sh' in 'sash' or 'surge'

listen to the pronunciation of a hissing sound such as the 's' or 'sh' in 'sash' or 'surge'
English - English
groove fricative

Groove fricatives all have more or less of an -like quality, and are for this reason sometimes called sibilants.

sibilant

Groove fricatives all have more or less of an -like quality, and are for this reason sometimes called sibilants.