Avoiceless bidental fricative is a rareconsonantal sound found in one natural language, in theShapsug dialect ofAdyghe, where it appears as a variant of/x/.^[1][2] People withhypoglossia (abnormally small tongue) may use it for target/s/.^{[citation needed]} It has been represented in theextIPA as ⟨x̪͆⟩, but since there is no frication at the velar place of articulation, it is thus better transcribed as ⟨h̪͆⟩ and the extIPA chart uses the latter.^[3]

Features of a voiceless bidental fricative:

• Itsmanner of articulation isfricative, which means it is produced by constricting air flow through a narrow channel at the place of articulation, causingturbulence.
• Itsplace of articulation isbidental, which means it is articulated with the lower and upper teeth pressed together.
• Itsphonation is un-voiced, which means it is produced without vibrations of the vocal cords.
• It is anoral consonant, which means that air is not allowed to escape through the nose.
• Because the sound is not produced with airflow over the tongue, thecentral–lateral dichotomy does not apply.
• Itsairstream mechanism ispulmonic, which means it is articulated by pushing air only with theintercostal muscles andabdominal muscles, as in most sounds.

• Voiceless dental fricative
• List of phonetics topics

• Fricative consonants
• Bidental consonants
• Voiceless oral consonants
• Pulmonic consonants

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