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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] .
Some examples: a word cannot end in certain consonants, and cannot begin with some consonants including r-, l- and ḻ-; there are six nasal consonants in Tamil: a velar nasal ங், a palatal nasal ஞ், a retroflex nasal ண், a dental nasal ந், a bilabial nasal ம், and an alveolar nasal ன்.
A labio-palatalized sound is one that is simultaneously labialized and palatalized.Typically the roundedness is compressed, like [y], rather than protruded like [u].The symbol in the International Phonetic Alphabet for this secondary articulation is ᶣ , a superscript ɥ , the symbol for the labialized palatal approximant.
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.