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Labial consonants

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Places of articulation
Labial
Bilabial
Labial-velar
Labial-alveolar
Labiodental
Bidental
Coronal
Linguolabial
Interdental
Dental
Alveolar
Apical
Laminal
Postalveolar
Alveolo-palatal
Retroflex
Dorsal
Palatal
Labial-palatal
Velar
Uvular
Uvular-epiglottal
Radical
Pharyngeal
Epiglotto-pharyngeal
Epiglottal
Glottal

Labial consonants are consonants in which one or both lips are the active articulator. This precludes linguolabials, in which the tip of the tongue reaches for the posterior side of the upper lip and which are considered coronals. The two by far most common labials are bilabials, articulated using both lips, and labiodentals, articulated with the lower lip against the upper teeth, both of which are present in English. Other labials include dentolabials, articulated with the upper lip against the lower teeth, the reverse of labiodental.

The most common distribution between bilabials and labiodentals is the English one, in which the stops, [m], [p], and [b], are bilabial and the fricatives, [f], and [v], are labiodental. Bilabial fricatives and the bilabial approximant do not exist in English, but do occur in many languages. For example, the Spanish consonant spelt b or v is pronounced as a voiced bilabial approximant between vowels.

Lip rounding, or labialization, is a common approximant-like co-articulatory feature. English /w/ is a voiced labialized velar approximant, which is far more common than the purely labial approximant. In the languages of the Caucasus labialized dorsals like /kʷ/ and /qʷ/ are very common.

Very few languages, however, make a distinction purely between bilabials and labiodentals, making "labial" usually a sufficient specification of a language's phonemes. One language that does make such a distinction is Ewe, having both kinds of fricatives, though the labiodentals are produced with greater articulatory force.

Lack of labialsEdit

While most languages make use of purely labial phonemes, a few generally lack them. Examples are Tlingit, Eyak (both Na-Dené), Wichita (Caddoan), and the Iroquoian languages except Cherokee. All of these languages have seen labials introduced under the influence of English.

See alsoEdit

General referenceEdit

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