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Nasal labial–velar approximant
Nasal labial–velar approximant
w̃

The nasal labial–velar approximant is a type of consonantal sound used in some languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨w̃⟩, that is, a w with a tilde. The equivalent X-SAMPA symbol is w~.

The nasal approximants [ȷ̃] and [w̃] may also be called nasal glides. In some languages like Portuguese, they form a second element of nasal diphthongs.

Features

Features of the nasal labial–velar approximant:

Its manner of articulation is approximant, which means it is produced by narrowing the vocal tract at the place of articulation, but not enough to produce a turbulent airstream.
Its place of articulation is labial–velar, which means it is simultaneously articulated with the lips and with the back part of the tongue (the dorsum) against the soft palate (the velum). The dorsal closure is made and released slightly before the labial closure, but they overlap for most of their duration.
Its phonation is voiced, which means the vocal cords vibrate during the articulation.
It is a nasal consonant, which means air is allowed to escape through the nose, either exclusively (nasal stops) or in addition to through the mouth.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
Its airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the intercostal muscles and abdominal muscles, as in most sounds.

Occurrence

Language		Word	IPA	Meaning	Notes
Kaingang^[1]		[w̃ĩ]		'to see'	Possible word-initial realization of /w/ before a nasal vowel.^[2]
Polish		są	[sɔũ̯]	'they are'	See Polish phonology
Portuguese	Most dialects^[3]^[4]	são	[sɐ̃w̃]	'saint', 'they are'	Allophone of /w/ after nasal vowels. See Portuguese phonology
Portuguese	Some dialects^[5]	muamba	[ˈmw̃ɐ̃bɐ]	'smuggling', 'jobbery', 'stash'	Non-syllabic allophone of /u/ between nasal sounds.
Marathi		संशय	[sə̃w̃ʃəe̯]	'doubt'	Anuswara (ṁ) preceding र (r), व (v), श (ś), ष (ṣ), स (s), ह (h) or ज्ञ (jñ/dnya) is rendered as 'w̃'.
Seri		cmiique	[ˈkw̃ĩːkːɛ]	'person'	Allophone of /m/
Shipibo^[6]		banwan^[7]	[βɐ̃ˈw̃ɐ̃]	'parrot'	Allophone of /w/ after nasal vowels.^[6]
Uwa		táw̃aya	[ˈtaw̃aja]	'yellow'
Yoruba		wọ́n	[w̃ɔ̃́n]	'they'	Allophone of /w/ before nasal vowels.

Notes

^ Jolkesky (2009:676, 681)
^ Jolkesky (2009:681)
^ Cruz-Ferreira (1995:127)
^ Bisol (2005:179)
^ Portuguese vinho: diachronic evidence for biphonemic nasal vowels
^ ^a ^b Valenzuela, Márquez Pinedo & Maddieson (2001:283)
^ "Shipibo language, alphabet and pronunciation". www.omniglot.com. Retrieved 2019-11-27.

References

Bisol, Leda (2005), Introdução a estudos de fonologia do português brasileiro (in Portuguese), Porto Alegre - Rio Grande do Sul: EDIPUCRS, ISBN 85-7430-529-4
Cruz-Ferreira, Madalena (1995), "European Portuguese", Journal of the International Phonetic Association, 25 (2): 90–94, doi:10.1017/S0025100300005223, S2CID 249414876
Jolkesky, Marcelo Pinho de Valhery (2009), "Fonologia e prosódia do Kaingáng falado em Cacique Doble", Anais do SETA, 3, Campinas: Editora do IEL-UNICAMP: 675–685
Valenzuela, Pilar M.; Márquez Pinedo, Luis; Maddieson, Ian (2001), "Shipibo", Journal of the International Phonetic Association, 31 (2): 281–285, doi:10.1017/S0025100301002109