A voiced bilabial nasal is a type of consonantal sound which has been observed to occur in about 96% of spoken languages.[1] The symbol in the International Phonetic Alphabet that represents this sound is ⟨m⟩. The bilabial nasal occurs in English, and it is the sound represented by "m" in map and rum. Very few languages (e.g. Wyandot) are known to lack this sound. A small number of languages have been observed to lack independent nasal phonemes altogether, such as Quileute, Makah, and Central Rotokas.[2]
Its manner of articulation is occlusive, which means it is produced by obstructing airflow in the vocal tract. Because the consonant is also nasal, the blocked airflow is redirected through the nose.
Its phonation is voiced, which means the vocal cords vibrate during the articulation.
It is a nasal consonant, which means air is exclusively allowed to escape through the nose for nasal stops; otherwise, in addition to through the mouth.
Because the sound is not produced with airflow over the tongue, the median–lateral dichotomy does not apply.
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