Nasal release
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In phonetics, a nasal release is the release of a plosive consonant into a nasal stop. Such consonants are also called prestopped nasals.
Prestopped nasals, and prenasalized stops, occur when the oral cavity is closed, and the nasal cavity is opened by lowering the velum, but the timing of these two events does not coincide.
The Slavic languages are most famous for having prestopped nasals. This can be seen in place names such as the Dniester River. The Russian word for "day", for example, is inflected день, дня, дни, дней [d̻ʲen̻ʲ, d̻ʲn̻ʲa, d̻ʲn̻ʲi, d̻ʲn̻ʲej], "day, day's, days, days'". (Here the "palatalized" stops are presented as laminal postalveolars.)
Prestopped nasals also found in Australia. The Eastern Arrernte language has both prenasalized stops and prestopped nasals, but does not have word-initial consonant clusters. Compare [mwarə] "good", [mpwaɻə] "make", [pmwaɻə] "coolamon".
Some languages which are reported to have unreleased stops turn out to have short voiceless nasal releases instead. Vietnamese is an example.