sib·i·lant
sI bə lənt
adjective
of, pertaining to, characterized by, or producing a hissing sound.
example: “S” is a sibilant consonant.
noun
a speech sound or consonant that resembles or suggests hissing, such as “s,” “sh,” or “ch”.
example: The poet chose words full of sibilants to evoke the hissing of the serpent’s voice.