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The 'bilabial trill' is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is B.
In many of the languages where the bilabial trill occurs, it occurs only as part of a prenasalised bilabial stop with trilled release, . This developed historically from a prenasalized stop before a relatively high back vowel, such as . In such instances, these sounds are usually still limited to the environment of a following .
was a lowercase form of B in Jaŋalif and similar alphabets.

Contents

Features

See also

Features

Features of the bilabial trill:

★ Its manner of articulation is trill, which means it is produced by vibrations of the articulators. In most instances, it is only found as the trilled release of a prenasalized stop.

★ Its place of articulation is bilabial which means it is articulated with both lips.

★ Its phonation type is voiced, which means the vocal cords are vibrating during the articulation.

★ It is an oral consonant, which means air is allowed to escape through the mouth.

★ It is a central consonant, which means it is produced by allowing the airstream to flow over the middle of the tongue, rather than the sides.

★ The airstream mechanism is pulmonic egressive, which means it is articulated by pushing air out of the lungs and through the vocal tract, rather than from the glottis or the mouth.

Language	Word	IPA	Meaning	Notes
Amuzgo			''
Baka			''
Lebang Ngwe			'ash'
Kele			'its fruit'
Mangbetu			--	contrasts with voiceless counterpart
Mewun			--	contrasts with voiceless counterpart
Pirahã	example needed		--	allophone of before
Liangshang Yi	example needed		--

See also

★ Voiceless dental bilabially trilled affricate

★ List of phonetics topics