|Voiceless bilabial trill|
This sound is typologically extremely rare. It occurs in languages such as Pará Arára and Sercquiais.
Features of the bilabial trill:
- Its manner of articulation is trill, which means it is produced by directing air over an articulator so that it vibrates.
- Its place of articulation is bilabial, which means it is articulated with both lips.
- Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
- It is an oral consonant, which means air is allowed to escape through the mouth only.
- Because the sound is not produced with airflow over the tongue, the central–lateral dichotomy does not apply.
- The airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the lungs and diaphragm, as in most sounds.
|Pará Arára||[ʙ̥utakeni]||'small and round cultivated field'|
- de Souza, Isaac Costa (2010). "3". A Phonological Description of “Pet Talk” in Arara (PDF) (MA). SIL Brazil. Retrieved 2014-01-09.