Labialization

labializedlab.labialrounded labialized labialisedlabial.labialisationlip roundinglabialized consonant
Labialization is a secondary articulatory feature of sounds in some languages.wikipedia
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Labialized velar consonant

labiovelarLabio- velarlabiovelars
The most common labialized consonants are labialized velars.
A labialized velar or labiovelar is a velar consonant that is labialized, with a -like secondary articulation.

Secondary articulation

co-articulatorysecondarilysecondary
Labialization is a secondary articulatory feature of sounds in some languages.
For example, the voiceless labialized velar plosive has a stop articulation, velar, with a simultaneous -like rounding of the lips.

Roundedness

unroundedroundedrounded vowel
When vowels involve the lips, they are called rounded.
It is labialization of a vowel.

Northwest Caucasian languages

Northwest CaucasianNorthwest Caucasian languageNorthwest
It is phonemically contrastive in Northwest Caucasian (e.g. Adyghe), Athabaskan, and Salishan language families, among others.
Linguistic reconstructions suggest that both the richness of the consonantal systems and the poverty of the vocalic systems may be the result of a historical process, whereby vowel features such as labialisation and palatalisation were reassigned to adjacent consonants.

Velar consonant

VelarvelarsDorso-velar
Out of 706 language inventories surveyed by, labialization occurred most often with velar (42%) and uvular (15%) segments and least often with dental and alveolar segments.
Many languages also have labialized velars, such as, in which the articulation is accompanied by rounding of the lips.

Velarization

velarizedvelarisedbroad
Most other labialized sounds also have simultaneous velarization, and the process may then be more precisely called labio-velarization.

Marshallese language

MarshalleseFour lettersLanguages of the Marshall Islands
Marshallese also has labialization at all places of articulation except for coronal obstruents.
Marshallese has a large consonant inventory, and each consonant has some type of secondary articulation (palatalization, velarization, or rounding).

Voiceless velar fricative

velar fricativex h ''' [x
For example, in the Athabaskan language Hupa, voiceless velar fricatives distinguish three degrees of labialization, transcribed either or.

Adyghe language

AdygheCircassianLowland Adyghe
It is phonemically contrastive in Northwest Caucasian (e.g. Adyghe), Athabaskan, and Salishan language families, among others.
A very unusual minimal contrast, and possibly unique to the Abzakh dialect of Adyghe, is a three-way contrast between plain, labialized and palatalized glottal stops (although a palatalized glottal stop is also found in Hausa).

Kabardian language

KabardianEast CircassianKabardian Adyghe
The series of labialized alveolar sibilant affricates and fricatives that exist in Adyghe became labiodental consonants in Kabardian, for example the Kabardian words мафӏэ "fire", зэвы "narrow", фыз "wife" and вакъэ "shoe" are pronounced as машӏо, зэжъу, шъуз and цуакъэ in Adyghe.

Latin

Latin languageLat.la
This contrast is reconstructed also for Proto-Indo-European, the common ancestor of the Indo-European languages; and it survives in Latin and some Romance languages.

Chaha language

ChahaCheha
However, the Chaha language also has a larger set of palatalized and labialized consonants than most other Ethiopian Semitic languages.

Coronal consonant

coronalcoronalscoronal consonants
Marshallese also has labialization at all places of articulation except for coronal obstruents.

Athabaskan languages

AthabaskanAthabascanAthabaskan language
It is phonemically contrastive in Northwest Caucasian (e.g. Adyghe), Athabaskan, and Salishan language families, among others. For example, in the Athabaskan language Hupa, voiceless velar fricatives distinguish three degrees of labialization, transcribed either or.

Abkhaz language

AbkhazAbkhazianabk
Abkhaz has a very large number of consonants (58 in the literary dialect), with three-way voiced/voiceless/ejective and palatalized/labialized/plain distinctions.

Hupa language

HupahupHupa-Chilula
For example, in the Athabaskan language Hupa, voiceless velar fricatives distinguish three degrees of labialization, transcribed either or.

Assimilation (phonology)

assimilationassimilatedassimilates
In phonology, labialization may also refer to a type of assimilation process.