adjective
Definition: Describing a sound that is hissing or characterized by a high-pitched, sharp quality, often associated with the letters 's' or 'sh'.
Example: The sibilant sounds in the poem created a soothing effect as I read it aloud.
noun
Definition: A type of speech sound that is characterized by a hissing or hushing quality, like the sounds made by the letters s, sh, z, and zh.
Example: In phonetics, a sibilant is a sound that creates a high-frequency noise, such as the 's' in 'snake'.