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The most common labialized consonants are labialized velars. Most other labialized sounds also have simultaneous velarization, and the process may then be more precisely called labio-velarization. The "labialization" of bilabial consonants often refers to protrusion instead of a secondary articulatory feature velarization.
Tamil phonology is characterised by the presence of "true-subapical" retroflex consonants and multiple rhotic consonants.Its script does not distinguish between voiced and unvoiced consonants; phonetically, voice is assigned depending on a consonant's position in a word, voiced intervocalically and after nasals except when geminated. [1]
For example, the Spanish consonant written b or v is pronounced, between vowels, as a voiced bilabial approximant. 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 [β̞].
A labialized velar or labiovelar is a velar consonant that is labialized, with a /w/-like secondary articulation.Examples are [kʷ, ɡʷ, xʷ, ɣʷ, ŋʷ], which are pronounced like a [k, ɡ, x, ɣ, ŋ], with rounded lips, such as the labialized voiceless velar plosive [kʷ] and labialized voiced velar plosive [ɡʷ], obstruents being common among the sounds that undergo labialization.
Labial–velar consonants are doubly articulated at the velum and the lips, such as [k͡p]. They are sometimes called "labiovelar consonants", a term that can also refer to labialized velars, such as the stop consonant [kʷ] and the approximant [w] .
In Akan, for example, the is compressed, as are labio-palatalized consonants as in Twi [tɕᶣi̘] "Twi" and adwuma [adʑᶣu̘ma] "work", whereas [w] and simply labialized consonants are protruded. [10] In Japanese, the /w/ is compressed rather than protruded, paralleling the Japanese /u/. The distinction applies marginally to other consonants.
However, a labialized palatal approximant and labio-palatalized consonants appear in some languages without front rounded vowels in the Caucasus and in West Africa, [2] such as Abkhaz, and as allophones of labialized consonants before /i/, including the [tsᶣ] at the beginning of the language name Twi.
The voiced labial–palatal (or labio-palatal) approximant is a type of consonantal sound, used in some spoken languages, for example, French huitième, read as [ɥitjɛm].It has two constrictions in the vocal tract: with the tongue on the palate, and rounded at the lips.