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Fricative Sign Video

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Definition

Fricatives are made by forming a nearly complete obstruction of the vocal tract. The opening through the air escapes is very small, and as a result a turbulent noise is produced (much as air escaping from a punctured tire makes a hissing noise). Such a turbulent hissing mouth noise is called frication.

Source: Language Files, eleventh edition, edited by Vedrana Mihalicek and Christin Wilson